Sarah Hirsh, Agriculture Agent | shirsh@umd.edu University of Maryland Extension, Somerset County
Cover crops can have various benefits such as scavenging nutrients, adding organic matter or nitrogen to the soil, reducing compaction, or competing with weeds. University of Maryland Extension is now offering a free service to consult with farmers to identify the top needs of their crop fields, and then plan and implement cover crops that will best address those needs. The grant-funded project will provide financial cost-share support for cooperating farmers. This support will complement the support provided by other cost-share programs, such as Maryland Department of Agriculture’s Cover Crop program.
Step 1. Farmer and University of Maryland Extension Ag Agent meet to discuss field conditions and plan cover crops based on specific field needs. For example, discuss:
Rotation and timing of cash crops
Soil and fertility needs
Pest pressures
Step 2. Farmer plants planned cover crops on fields.
Farm located in Caroline, Cecil, Dorchester, Kent, Queen Anne’s, Somerset, Talbot, Wicomico, or Worcester county.
Fields should be 10-50 acres, with up to 3 fields per farm (max 150 acres per farm).
Grain crop should be in the crop rotation.
Payment details:
Participating farmers will get payment of $45-$75/Acre from MDA program, different rates determined by species and planting and termination dates.
Participating farmers will get additional $30/Acre from our grant project for being part of our research efforts and trying out innovative cover cropping approaches.
To learn more or sign-up, contact Sarah Hirsh (410) 651-1350 | shirsh@umd.edu.
University programs, activities, and facilities are available to all without regard to race, color, sex, gender identity or expression, sexual orientation, marital status, age, national origin, political affiliation, physical or mental disability, religion, protected veteran status, genetic information, personal appearance, or any other legally protected class.
Luke Macaulay, Wildlife Management Specialist | lukemac@umd.edu University of Maryland Extension
Please save the date of July 20, 2023, from 9am-2pm, for a symposium titled “Public Land & Private Partnerships for Early Succession Habitat.”
Dramatic declines in pollinators and grassland and shrub-dependent birds like bobwhite quail, meadowlarks, and more highlight the need for habitat improvement efforts on a broad scale. Our vision is for this meeting to provide education, networking, and inspiration to facilitate habitat improvement efforts across the region.
Confirmed speakers include Secretary Kurtz of the Maryland Department of Natural Resources, Director Pat Emory of the Delaware Fish& Wildlife Division, Dan Murphy of U.S. Fish and Wildlife Service, and speakers from Washington College, the Natural Resource Conservation Service, private landowners and more.
Register now at go.umd.edu/quailmeeting. Please share with other landowners and land managers interested in the topic.
The event will be held at the National Wildlife Visitor Center in Laurel, Maryland. A list of speakers and the agenda will be forthcoming.
This event is being organized by Eddie Beck, Chapter Volunteer & President of the Chesapeake Bay Chapter Quail Forever, and Luke Macaulay, Wildlife Management Specialist with the University of Maryland Extension.
Reports are for crop conditions up to June 1, 2023.
Western Maryland
To say we are dry would be an understatement. Corn planting is winding down and the last of the full-season beans will soon be finished up too. Barley and wheat are in full head a bit ahead of normal, whatever that is. The dry weather is a good thing for cereals as the conditions are poor for fungal growth. It will be interesting to see what effect the dry weather will have on test weight and yield. First cutting alfalfa and most of the grass hay is in the barn or silo. Rain will be important very soon for forage regrowth and corn and bean growth. The cool evenings and overnights have been the only blessing but heat is on the way.—Jeff Semler, Washington Co.
Central Maryland
Frederick County has finished planting corn. There may be the occasional field that remains, but this is the exception. Early corn is at the V4-5 stage while later planted fields are approaching V2. Seedling diseases have been nearly non-existent in scouted fields, though wireworm pressure has been observed in both corn and soybean fields. Soybeans are 90% planted; early beans are around V2 while most are VC-V1. The majority of the hay crop is made and in the barn. Annual weeds have emerged and are approaching a foot tall in some fields, though weed pressure has remained limited given the dry weather and resulting effective burndown applications. Second cutting alfalfa is underway, some weevil pressure had been observed in the occasional field though generally there has been relatively limited pressure. Most barley is at or near soft-dough stage, while the wheat crop has finished flowering and is moving into grain fill. Both small grain crops appear in good to great condition given the limited disease pressure.—Mark Townsend, Frederick Co.
Northern Maryland
We got through the entire month of May without any measurable precipitation. Such weather has made for great conditions for making hay, and this is one of the few times in recent memory where pretty much all of the first cutting hay crop was put up before June 1; although yields did appear to suffer in some fields due to the dry weather. 99% of the corn crop is planted and emerged, with earliest planted corn around V5-6. Almost all full-season soybeans have been planted and are anywhere from just planted to V3-4. Both corn and soybeans have yet to show wilting, but they are both growing very slowly due to the lack of rain. Fortunately we are running well below with temperatures in the 70s most of the month. Wheat is just starting to turn and appears to have very little disease pressure; we will see how the dry spring affects yield and test weight. We are hoping for a bit of rain in the coming weeks.—Andy Kness, Harford Co.
Upper and Mid Shore
Early planted corn greened up, but definitely has reduced yield potential. Later planted corn looks great- good color and uniform. Early beans are finally outgrowing slug feeding. Like corn, later beans look great. Barley harvest will begin 1st week of June. Wheat is starting to turn. There was great hay made last week. Soil conditions across the region are getting dry.—Jim Lewis, Caroline Co.
Lower Shore
Wheat and barley are drying down. Corn has been planted, and is generally around V1 to V5 stage. Most soybean has been planted and early soybean plantings have emerged. Herbicide-resistant weeds, such as common ragweed, marestail, and palmer amaranth, are starting to emerge. Scout and spray early to stay ahead on control. Some farmers have utilized late-terminated cover crops to help manage weed pressure through providing a mulch on the soil surface. Deer are prevalent in fields and causing damage on corn and soybean seedlings.—Sarah Hirsh, Somerset Co.
Southern Maryland
Temperatures finally touched the 80°F mark this week. Cooler temperatures and lack of rainfall has slowed crop progress in May. Most corn fields are a kaleidoscope of yellow shades and uneven stands. Black cutworms, slugs, wireworms and seed corn maggot are active across the region. We received scattered showers last weekend that helped crop conditions improve in most areas. Soybeans follow much of the same story. Early planted beans look decent. Barley is drying down with harvest expected any day. Wheat will not be far behind. Ryegrass continues to be a challenge for producers in both burndown situations in corn and beans, as well as small grains. My thought is the cooler weather is affecting the performance of glyphosate, especially on larger plants. The pockets of glyphosate resistant ryegrass are expanding in our area as well. The drier weather has been good for making hay- we saw a lot of balers in the field last week.—Ben Beale, St. Mary’s Co.
The program will start at the seed building and proceed to the fields. We will hear an update on the Agronomy degree program within the Department of Plant Science and Landscape Architecture, including highlights from the first semester teaching AGST401: Tractor and Equipment Operation, Safety and Maintenance. We will showcase a commercial variety strip trial organized by the Maryland Crop Improvement Association (MCIA) and industry reps will be on hand to discuss their entries in the trials. Dr. Vijay Tiwari will discuss the small grain variety trials and his wheat breeding program, Dr. Nidhi Rawat will discuss her pathology work in barley and wheat, and Dr. Kurt Vollmer will update us on weed control in wheat.
Dinner will be served at 5pm, sponsored by Maryland Crop Improvement Association and others.For additional program information, contact Dr. Nicole Fiorellino at nfiorell@umd.edu or 443-446-4275.
The 2023/24 U.S. corn outlook is for larger production, greater domestic use and exports, and higher ending stocks. The corn crop is projected at a record 15.3 billion bushels, up more than 10 percent from last year on increases to both area and yield. The yield projection of 181.5 bushels per acre is based on a weather-adjusted trend assuming normal planting progress and summer growing season weather, estimated using the 1988-2022 time period. With beginning stocks up slightly, total corn supplies are forecast at 16.7 billion bushels, the highest since 2017/18. Total U.S. corn use for 2023/24 is forecast to rise about 5 percent relative to a year ago on higher domestic use and exports. Food, seed, and industrial use is projected to rise 55 million bushels to 6.7 billion. Corn used for ethanol is projected to increase 1 percent, based on expectations of modest growth in motor gasoline consumption and ethanol’s inclusion rate into gasoline. Feed and residual use is projected higher on a larger crop and lower expected prices. U.S. corn exports for 2023/24 are forecast to rise 325 million bushels to 2.1 billion, as lower prices support a sharp increase in global trade following the decline seen during 2022/23. U.S. market share is expected to increase slightly albeit remain below the average of the past 5 years. Exports are higher for Argentina and Brazil, with the former reflecting a return to normal weather conditions after a drought during 2022/23. Despite a rebound in U.S. exports, Brazil is forecast to be the world’s largest exporter of corn for the second consecutive year. Exports for Ukraine are projected to decline based on lower production prospects. With total U.S. corn supply rising more than use, 2023/24 ending stocks are up 805 million bushels from last year and if realized would be the highest in absolute terms since 2016/17. Stocks would represent 15.3 percent of use, the highest since 2018/19. The season-average farm price is projected at $4.80 per bushel, down $1.80 from 2022/23.
Soybean
The 2023/24 outlook for U.S. soybeans is for higher supplies, crush, and ending stocks, and lower exports compared with 2022/23. The soybean crop is projected at 4.51 billion bushels, up 5 percent from last year’s crop mainly on higher yields. With lower beginning stocks partly offsetting increased production, soybean supplies are forecast at 4.75 billion bushels, up 4 percent from 2022/23. Total U.S. oilseed production for 2023/24 is projected at 132.8 million tons, up 6.9 million from 2022/23 mainly on higher soybean production. Production forecasts are also higher for canola, peanuts, and cottonseed. The U.S. soybean crush for 2023/24 is projected at 2.31 billion bushels, up 90 million from the 2022/23 forecast on favorable crush margins and strong demand for soybean oil as a biofuel feedstock, which is projected to increase 900 million pounds to 12.5 billion. Domestic soybean meal disappearance is forecast to increase 2 percent from 2022/23 on lower soybean meal prices and modest growth primarily in poultry production. U.S. soybean meal exports are forecast at 14.8 million short tons, leaving the U.S share of global trade slightly above the prior 5-year average. U.S. soybean exports are forecast at 1.98 billion bushels, down 40 million from 2022/23 with strong competition from increasing South American production and limited gains in global import demand. U.S. ending stocks for 2023/24 are projected at 335 million bushels, up 120 million from the revised 2022/23 forecast. Soybean and product prices are all forecast lower for 2023/24. The 2023/24 U.S. season-average soybean price is forecast at $12.10 per bushel compared with $14.20 per bushel in 2022/23.
Wheat
The 2023/24 outlook for U.S. wheat is for reduced supplies and exports, increased domestic use, and smaller stocks compared with 2022/23. U.S. wheat supplies are forecast lower than last year with smaller beginning stocks and only slightly larger production. All wheat production is projected at 1,659 million bushels, up modestly from last year on increased harvested area. However, the harvest-to-plant ratio is down from last year with above-average abandonment in Texas, Oklahoma, and Kansas. The all wheat yield, projected at 44.7 bushels per acre, is 1.8 bushels lower than last year. The first survey-based production forecast for 2023/24 winter wheat is up 2 percent from last year as higher Soft Red Winter production more than offsets a decline in Hard Red Winter and White wheat. Total 2023/24 domestic use is projected at 1,112 million bushels, up 1 percent from last year, primarily on increased feed and residual use. Exports are projected at 725 million bushels, 50 million lower than last year. Ending stocks are projected 11 percent lower than last year and the lowest in 16 years. The projected 2023/24 season-average farm price is $8.00 per bushel, down $0.85 from last year’s record.
Alyssa Koehler, Extension Field Crop Pathologist | akoehler@udel.edu University of Delaware
Wheat anthesis (flowering) is underway and will be continuing for the next 1-2 weeks across the region. Up until the rains this past weekend, we have been at low FHB risk. We are currently tracking as medium-high risk for very susceptible varieties and low-medium risk for varieties with some level of resistance (Figure 1). If you are planning for wheat fungicide application, scout frequently, looking for yellow anthers in the center of the wheat head (Figure 2) to signal that flowering has begun (Feekes 10.5.1). Depending on the weather, we can usually expect flowers to start showing up on wheat heads 3-5 days after full head emergence, with cool weather this can stretch this process out to 7-10 days. Anthers can remain attached after flowering, but become a pale white. For best mycotoxin (DON) control, it is better to be at flowering or a few days beyond than to spray too early when heads are not out yet (especially those secondary tillers). Fungicide products should be applied at the manufacturers recommended rate with nozzles angled 30-45° from horizontal (30 degrees is better than 45). Nozzles angled both forward and backward or twinjet nozzles that spray in two directions give better contact with the head and increase fungicide efficacy. For ground sprays, fungicides should be applied in at least 10-15 gallons of water per acre; aerial applications are recommended at 5 gallons per acre.
Figure 1. FHB Risk Model for very susceptible (top) and susceptible varieties (bottom) May 3, 2023 (wheatscab.psu.edu).Figure 2. Wheat at flowering (Feekes 10.5.1) with yellow anthers visible 3-4 days after heads emerge.
Once wheat has flowered, symptoms of FHB are usually visible in 18-24 days, but cool weather can slow symptom development. Heads with FHB will have bleached florets or bleached sections of the head and may have pink growth on spikelets. Glume blotch may also be present, but typically has more of a grey appearance. You can follow these steps to assess the severity of FHB present in your field.
For every 10 acres of field, randomly select one spot to survey.
Keeping your line of sight above the wheat heads, walk 40-50 yards and randomly pick 10-20 heads to look at on the plant or detach and place into a bag. (Looking down may bias the heads you select).
Once you have randomly collected the heads, rate the percent of each head with symptoms of FHB (bleaching or pink growth on spikelets). You can use the scale below to help calibrate your eye (next page).
After you have recorded values for each head, determine the average percent FHB severity by dividing the sum of disease severities by the total number of heads collected. (Ex. You rate 10 heads with severity values: 0%, 10%, 30%, 0%, 0%, 20%, 10%, 0%, 0%, 0%. These add up to 70. 70/10 heads = 7% overall FHB severity). Higher levels of FHB are typically associated with elevated levels of DON and possible issues with yield and test weight. It is possible to have delayed or lower levels of symptoms and still have DON.
Repeat this assessment as needed to get an overall rating for the field. Fields with greater than 10% FHB severity are at higher risk for yield losses or elevated DON. Fields with elevated DON should be harvested as early as possible and you may want to consider increasing combine fan speeds and shutter openings to reduce the amount of scabby kernels harvested.
Reports are for crop conditions up to May 4, 2023.
Western Maryland
Welcome rains fell over the weekend but cooler temperatures will stall the corn that has been planted. Most of the triticale has been harvested and the barley is in head. First-cutting alfalfa will soon be mowed when sun and rain allow. Corn planting will continue at breakneck speed since soybeans are haunting farmers from their seed sheds. Thus far peaches and apples are faring ok as long as the nighttime cold temps don’t drop too far. Spirits are high since our recent rains and farmers are eternal optimists.—Jeff Semler, Washington Co.
Central Maryland
We have finally received some much needed rain, with areas around the county getting a total of 2-3 inches in the past several days. However, this cool and wet weather has slowed planting, as well as crop and summer annual weed emergence. A majority of corn has been planted. Some emerged corn is yellow due to the cooler weather. Barley and wheat are heading.—Kelly Nichols, Montgomery Co.
Much of the small grain acres for forage have been harvested in the last three to four weeks. Many wheat acres are moving past flag-leaf and into heading, though this has been slowed with recent weather. Barley across the county, though short, is headed and into flowering. Some early planted corn has emerged and generally appears okay, however the cooler temperatures have slowed development and in some cases resulted in a few more yellow leaves. Not many soybean acres have been planted thus far, though the ones that have are not yet emerged.—Mark Townsend, Frederick Co.
Northern Maryland
The season was off to an early start, with most everyone that had a corn planter had it rolling full tilt by April 20 or so, which is normally around the time folks are just playing around with planter settings. Since last week, the rains came and temperatures took a nose dive and we went from hot and dry to cool and wet, which has stopped planting. Right now a good majority of the corn crop is planted, with some emerged and looking ok but it is probably wondering where the warm weather went. Some soybeans have been planted, but not a lot. This weather brings the possibility of slug pressure. Early wheat varieties have already flowered; later varieties should be heading in the next few days.—Andy Kness, Harford Co.
Upper and Mid Shore
We were ahead of schedule planting until the heavy rains last week. Soil moisture is optimum/excessive with last weeks 4-6” rain. Early planted corn has faded to a yellow hue with the recent cold weather. Early planted beans have been providing slugs, breakfast, lunch, and dinner with cloudy damp weather. Planters are full and tractors are fueled up waiting for dry sunny weather. Small grain has headed and is being sprayed with scab protectant fungicides. A little dot of hay was made before the rains.—Jim Lewis, Caroline Co.
Lower Shore
After a very dry couple of weeks, we had a heavy rainfall last weekend, ranging from 3-4 inches across the lower shore. Corn planting began before the rain, and now farmers are waiting for the ground to dry out to continue. Some farmers are concerned they will have to replant some corn acreage planted prior to the rain. Winter wheat is looking good and heading out. Fungicides are being sprayed on wheat. Most cover crops have been terminated, but those that remain look great and will provide a nice mulch for reducing summer weed pressure.—Sarah Hirsh, Somerset Co.
Southern Maryland
Planters have been running for weeks now. May-like temperatures in April brought about nearly ideal conditions, and many folks rolled the dice with early planting. It appears it was a good bet as stands have emerged well with no frost. I suspect we are close to 90% planted in So MD. We have many acres of early planted soybeans again this year. Rain was hard to come by with soil conditions becoming dry a couple of weeks ago. Rain 10 days ago and last weekend was much needed though it delayed planting progress. The current week of cooler weather has slowed crop progress, but overall we are in good shape. With recent rains, keep an eye out for slugs in newly emerged fields. In other crops, barley is headed out with some fields turning already. Wheat is headed and flowering now. We have seen an extended flowering period in wheat this year, with a lot of variability in flowering across the same fields. Alfalfa weevil pressure has been high this year. Be sure to scout fields for weevil injury. I have seen a lot of fields with a white cast due to severe feeding injury. In our area, pyrethroids are no longer working well due to resistance. Steward EC is the best alternative. On the fruit and vegetable front, plasticulture strawberries has an excellent growing season and are ripening now. I expect a bumper crop of berries this year. All of our main season vegetable crops are preparing to go in the ground this week.—Ben Beale, St. Mary’s Co.
This month’s ‘22/23 U.S. corn outlook is for reductions to imports and food, seed, and industrial (FSI) use, with unchanged ending stocks. Corn imports are lowered 10 million bushels based on observed trade to date. Feed and residual use is unchanged at 5.275 billion based on indicated disappearance during the December-February quarter. FSI is lowered 10 million bushels reflecting cuts to corn used for glucose and dextrose and starch. With supply and use falling by the same amount, ending stocks are unchanged at 1.342 billion bu. The season-average price is unchanged at $6.60 per bu.
Soybeans
U.S. soybean supply and use forecasts for ‘22/23 are unchanged relative to last month. Soybean and soybean meal prices are also unchanged. The soybean oil price is projected at 64.0 cents per pound, down 2 cents. Global ‘22/23 soybean supply and demand forecasts include lower production, crush, and exports. Global soybean production is reduced 5.5 million tons to 369.6 million. Lower crops for Argentina and Uruguay are partly offset by higher production for Brazil. Soybean production for Argentina is lowered 6.0 million tons to 27.0 million on hot and dry weather conditions through March. Uruguay production is lowered 0.9 million tons to 1.2 million on a lower harvested area and yield. Partly offsetting is higher production for Brazil, increased 1.0 million tons to 154.0 million on higher area. Soybean crush is lowered on reduced supplies and slow pace to date for Argentina, China, Bangladesh, Pakistan, and Egypt. Crush for Argentina is reduced 3.3 million tons to 32.0 million leading to lower product exports. Partly offsetting is higher crush and higher soybean oil and meal exports for Brazil. Soybean exports are lowered 0.4 million tons to 168.0 million on lower exports for Uruguay. Imports are lowered for Bangladesh, Egypt, and Pakistan and raised for Argentina. Soybean ending stocks are raised fractionally with higher stocks for China and Brazil that are mostly offset by lower stocks for Argentina.
Wheat
The outlook for ‘22/23 U.S. wheat this month is for slightly higher supplies, reduced domestic use, unchanged exports, and increased ending stocks. Supplies are raised 5 million bushels on higher imports, based on the pace of Census imports reported to date. Domestic use is lowered 25 million bushels on reduced feed and residual use, which is decreased to 55 million. The downward revision is based on the implied disappearance for the second and third quarters indicated in the NASS Grain Stocks report. Wheat exports remain at 775 million bushels but there are offsetting by-class changes for White and Hard Red Spring exports. Projected ‘22/23 ending stocks are raised 30 million bushels to 598 million but are still 14% below last year. The ‘22/23 season-average farm price is forecast $0.10 per bushel lower at $8.90, based on NASS prices reported to date and expectations for cash prices for the remainder of ‘22/23. The global wheat outlook for ‘22/23 is for increased supplies, higher consumption, and reduced trade and stocks. Supplies are raised 0.7 million tons to 1,061.1 million, primarily on higher beginning stocks for Syria and increased production for Ethiopia. Global consumption is increased 2.9 million tons to 796.1 million, mainly on higher food, seed, and industrial use for India, and increased feed and residual use for China and the EU. World trade is lowered 1.2 million tons to 212.7 million on reduced exports by the EU, Argentina, and Brazil more than offsetting increases for Russia and Ukraine. China’s wheat imports are raised 2.0 million tons to 12.0 million, which would be the highest imports for China since 1995/96. China’s imports are raised on strong imports to date, particularly from Australia; China is now the leading 2022/23 global wheat importer. Projected 2022/23 world ending stocks are lowered 2.1 million tons to 265.1 million, the lowest since 2015/16. This month, India, the Philippines, and Ukraine are projected to have lower stocks, more than offsetting increases for Syria, the EU, and the United States.
Seyedali Hosseinrad, Nidhi Rawat, Nicole Fiorellino, and Vijay K. Tiwari Department of Plant Science and Landscape Architecture, University of Maryland, College Park
Fusarium Head Blight of wheat and barley
Fusarium head blight (FHB) is a severe fungal disease that affects small grains, wheat and barley. It is particularly problematic in regions with wet and warm springs, such as the Mid-Atlantic region. FHB is caused by several species of Fusarium, F. graminearum being the most common in the USA.
Symptoms and signs: The disease primarily attacks the wheat and barley heads, or spikes, at flowering. Early symptoms of FHB include the appearance of small, water-soaked lesions on the glumes and awns of the heads. As the infection progresses, these lesions become larger, and the spikelets (sections of the heads) become brown and dry progressively (Figure 1a, b). In particularly conducive weather conditions, the spikelets may take on a pink or reddish color due to a mass production of fungal spores called sporodochia on the glumes. The disease causes the kernels to shrink or abort, leading to reduced yield, poor-quality grain, and in severe cases, crop failure (Fig. 1 c). In addition, the fungus also produces mycotoxins, such as Deoxynivalenol (DON), which is toxic for human and animal consumption. The epidemiology of FHB is complex and multifaceted and can be influenced by various factors, including weather conditions, crop management practices, and genetic susceptibility.
Figure 1. FHB symptoms on wheat and barley. A.) Wheat heads showing brown and bleached spikelets indicated by yellow arrows. B.) A malting barley spike showing bleached spikelets. C.) Fusarium damaged kernels.
Factors affecting FHB
Weather conditions play a major role in determining the severity of FHB in field conditions. The disease thrives in warm, wet environments and is severe in areas with high humidity and frequent rainfall. Wet weather conditions during the flowering stage of wheat development provide an ideal environment for the fungus to infect and proliferate on the developing grain heads. In particular, warm and humid weather between heading and anthesis (flowering) is highly conducive to FHB infection. Warm temperatures between 70 and 80°F are favorable for fungal growth and production of mycotoxins.
Crop management practices can also contribute to the development and spread of FHB in winter wheat. Practices such as reduced tillage and corn-wheat rotation can increase the risk of FHB infection. Reduced or no-tillage can leave plant debris on the soil surface, providing a potential source of inoculum for the fungus. At the same time, corn acts as a secondary host of the pathogen, allowing the fungal inoculum to build up in the soil over time.
Management of FHB
Effective management of FHB in winter wheat typically involves using an integrated disease management approach that incorporates a combination of cultural, chemical, and biological control measures.
Use of FHB-resistant varieties: One of the most important cultural practices for reducing FHB infections in wheat is the selection of resistant cultivars. Several wheat varieties have been developed with genetic resistance to FHB. In fact, the UMD small grain pathology program, in collaboration with the small grain breeding program, tests upward of 60 regional commercial varieties in their misted nursery in replicated trials every year to provide growers with a robust assessment of the levels of the genetic resistance of these varieties to FHB (https://psla.umd.edu/extension/md-crops). It is highly advisable for regional farmers to refer to these ratings for making their planting decisions to reduce the severity of infections in their crops.
Due to the importance of FHB in the Mid-Atlantic region, developing FHB-resistant varieties is one of the primary goals of the MD small grain breeding program, in addition to their yield and quality. Resistance to FHB is a complex genetic trait and is influenced by a range of genetic factors. So, any breeding program targeting to incorporate a high level of genetic resistance in their varieties has to pyramid several genes toward that goal. However, a high level of genetic resistance in barley is difficult to achieve on account of the lack of resistance genes available in it.
Chemical control: The use of fungicides is a key component of FHB management in wheat and barley. Fungicides can effectively reduce the severity of infections and minimize the production of mycotoxins. Fungicides with Group 3 and 7 FRAC code ingredients have been successful in controlling FHB. FRAC group 11 fungicides should not be applied for FHB, as there are reports of them increasing DON content in the grains. Several effective chemistries with a mix of active ingredients against FHB have recently been released by manufacturers, such as Prosaro-Pro and Prosaro by Bayer, Miravis-Ace by Syngenta, and Sphaerex by BASF. All these fungicides have been tested by the UMD Small grain pathology program and are found to be equally effective when sprayed at anthesis.
In addition to the chemistry of the fungicide, the timing of spraying is very critical in managing FHB. Spraying fungicides at anthesis (when yellow anthers pop out of the wheat heads) in wheat and heading in barley is important. As weather plays a major effect in determining the severity of FHB infection, the risk of FHB can be predicted with a significant correlation with conducive weather conditions. In conjunction with the US Wheat and Barley Scab Initiative, the MD small grain program releases FHB risk commentaries for growers registered with the FHB risk prediction website (https://www.wheatscab.psu.edu/). The growers are advised to register on this website to receive the alerts on their cell phones as text messages with advice on spraying decisions for FHB.
Biological control: Some biological control agents, such as bacterial and fungal species antagonistic to FHB, are available with the claims of reducing disease severity and mycotoxin production. However, the efficacy of these biological control agents is not high yet. Researchers at UMD are testing some new promising biological products currently under development, especially for the organic growers of the region.
Crop Rotation and Tillage: Other important cultural practices include crop rotation and tillage. Planting non-host crops such as soybeans in rotation with wheat can help reduce the amount of FHB inoculum in the soil, as corn is a secondary host of the pathogen and can increase inoculum build-up in the soil for the wheat crop. Reduced tillage practices that manage crop residue on the soil surface with minimal disturbance to the soil are helpful in reducing the amount of infected crop residue on the soil surface while minimizing soil erosion and loss.
Post-harvest management: Post-harvest management practices, such as grain cleaning and drying, can help to screen the Fusarium damaged kernels that are expected to have high levels of mycotoxin contamination in the harvested grain. Cleaning equipment such as air screen cleaners or gravity tables can remove lightweight and damaged kernels. Drying grain to a moisture content of 14% or lower as soon as possible after harvest can also help minimize mycotoxin contamination. The fungus may continue mycotoxin production at high moisture conditions in storage. Proper storage conditions, such as cool and dry storage facilities, can also help to prevent mycotoxin contamination during storage.
Fusarium head blight (FHB) is a significant fungal disease affecting wheat and barley crops in the Mid-Atlantic region, causing yield and quality losses. Small grain pathology and breeding programs are working on multipronged approaches to reduce FHB impact, such as using fungicides, developing resistant cultivars, and adopting cultural practices such as crop rotation and tillage management. Also, research and innovation are crucial to ensure the region’s long-term sustainability of wheat production.
For more information:
Gillum, M., & Van Sanford, D. (2023). Understanding the Effect of Fusarium Head Blight Resistance on Agronomic Characteristics of Soft Red Winter Wheat.
Singh, L., Wight, J.P., Crank, J., Thorne, L., Erwin, J.E., Dong, Y., Rawat, N. (2021). Evaluation of application timing of Miravis-Ace for control of Fusarium head blight and DON content in wheat. Plant Health Progress. 22: 94-100.
Singh, L., Wight, J.P., Crank, J., Thorne, L., Dong, Y., Rawat, N. (2020). Efficacy assessment of a new fungicide, Miravis Ace, for control of
Galen Dively, Professor Emeritus | galen@umd.edu University of Maryland, College Park
Listed below are the corn trait packages to make it easier to understand seed guides, sales material and bag tags. It is an abbreviated version of the Bt trait table plus related extension materials free online at: https://www.texasinsects.org/bt-corn-trait-table.html. Information listed Includes the name of each trait package, bag tag code, Bt toxins expressed (Cry1 types and Vip3A for caterpillars, Cry3 types for rootworms), refuge requirement (RIB=% refuge in the bag or REF=% structured refuge) and herbicide tolerance (GLY= glyphosate /Roundup-Ready, LL=glufosinate/Liberty Link, 2,4D or group 1 ‘fops’ type herbicides). Note that older trait packages, with limited or no commercial availability, are listed, so you can look back and interpret previous year’s planting records, seed guides, and research results.
The widely adopted use of Bt corn has resulted in major benefits to growers and the general public. However, resistance evolution in target insect populations has become a major threat to the sustainability of these crops. In some parts of the US Corn Belt, western corn rootworm rapidly adapted to Bt corn, and currently, some populations show resistance to all commercially available Cry3 traits. The high dose expression of Cry1 and Cry2 traits continues to provide excellent control and areawide suppression of the European corn borer in the US; however, the first case of resistance to the Cry1F toxin was reported in Nova Scotia in 2018 and resistance to other Cry toxins was recently confirmed in several eastern Canadian provinces. For corn earworm, we now have widespread field-evolved resistance to all Cry toxins in Bt corn. However, the Vip3A trait still provides excellent protection against this pest but studies show early stages of resistance developing since 2017, mainly in the southern states. Fall armyworm has been targeted by the Cry1F toxin since 2003, without any evidence of field-evolved resistance until 2010 when widespread control failures in Bt corn were reported in Puerto Rico and recent studies show high levels of resistance in several southeastern U.S. states.
