Category Archives: Commodity

Wheat Disease Update – April 12, 2016

Stripe rust has been found on wheat in southeastern Virginia (Suffolk) and the Eastern Shore (Northampton County). Stripe rust is not observed every year, but it can be more aggressive than leaf rust and spread very quickly if temperatures are moderately warm and humidity/rainfall is high. Many wheat varieties are susceptible, and we do not have good stripe rust ratings for the region because the disease is fairly rare. Pictures showing typical symptoms of leaf rust and stripe rust are below. Fields should be scouted, and keep in mind it is more important to catch stripe rust early than leaf rust. If a field has good yield potential and stripe rust is present, a fungicide application is recommended. In addition to rust, powdery mildew has been reported from throughout Virginia and leaf blotch has been observed in southeastern Virginia, so as the wheat crop approaches the flag leaf emergence growth stage, it is time to start thinking about disease management. For specific fungicide recommendations, see my earlier post (April 7, 2016).

Stripe Rust

Leaf Rust

Leaf Rust

Wheat Disease Update April 7, 2016

As the wheat crop approaches the flag leaf emergence growth stage, it is time to start thinking about disease management. When conditions are conducive to disease development (e.g. high humidity, warm temperatures) foliar fungicide applications may be necessary to protect wheat yield and quality. The mild winter in 2014/2015 resulted in early onset of foliar diseases in some areas, and powdery mildew and rust were reported from a few fields as early as December. Recently, powdery mildew has been reported from throughout Virginia, leaf blotch has been observed in southeastern Virginia, and leaf and stripe rust have been reported just south of Virginia in North Carolina.

Wheat Powdery Mildew

Wheat Powdery Mildew

Once the flag leaf emerges, this leaf surface, which feeds the developing grain, should be protected from disease if symptoms are observed on the lower leaves and conditions are conducive to disease development. Fungicides containing a strobilurin should not be applied after heading but are a good option for control of foliar diseases as the flag leaf emerges. Late applications of strobilurins can increase DON (vomitoxin) if scab infections occur during flowering. Triazoles including Caramba, Proline, and Prosaro are good options for scab control and will also control late-season foliar disease. Currently, scab risk in the region is low but growers should consult the FHB prediction tool (http://www.wheatscab.psu.edu/) as the crop gets closer to flowering. Ideally, fungicide applications should be made based on scouting and/or risk of infection and disease development due to weather conditions. A fungicide efficacy table for many of the products registered for wheat can be found below.

2016 Wheat Fungicide Efficacy Table

As always, for more information on disease management in field crops feel free to contact Dr. Hillary Mehl, Extension Plant Pathologist by email (hlmehl@vt.edu) or phone (757-657-6450 ext. 423).

Peanut “talks”

As we are getting close to a new peanut season, I thought you might want to know in summary what peanut “pointers” in the region and beyond are envisioning for 2016. Here I prepared a compilation of news, comments, and recommendations from the peanut specialists across the country; I included some of my own thoughts as well.

Unanimously, cultivar selection seems to be the most important production decision. Virginia-type cultivars Bailey, Sugg, Sullivan, Wynne, and Emery are recent releases, but registered seed for 2016 production is only available for the first four. They can produce high yields (Bailey in particular) and have good disease resistance package (Sullivan in particular). Bailey and Sugg have normal oil chemistry, and the others are high oleic cultivars. Wynne, Sugg, and Emery have larger kernels than Bailey and Sullivan. Runners can also be successfully grown in Virginia. Georgia-09B, Florida-07, FloRun™ ‘107’, TUFRunner™ ‘297’, and TUFRunner™ ‘511’ are preferred by shellers. I only tested Georgia-09B and Florida-07 in the past, and they both yielded comparable with Georgia-06G and Bailey. I will have an answer about the others for the next year’s planting season.

Speaking about planting, three things were always mentioned at specialist talks: rotation, rotation, and rotation. In Virginia, we are now seeing good yields because of good genetics and rotation; I don’t think we changed other cultural practices by much but could afford longer rotations when acreage dropped. In one out of three or more years peanut should be planted in the same field. Good rotation crops are corn, sorghum, cotton, and small grains, but not soybean. With longer rotations, beneficial Rhizobia bacteria should be provided at planting for optimum nitrogen fixation. Bacteria are living organisms. Handling it with care is what ensures successful inoculation. For us, liquid inoculant applied in furrow on top of the seed worked very well for the past few years. Nitrogen fertilizer seems never to work as well for peanut as an efficient inoculation.

Legumes including peanut are good scavengers of phosphorus and potassium, but require calcium, boron, and manganese, which are deficient in sandy soils preferred by peanut. Calcium and boron deficiencies are difficult to detect until after harvest in the form of “pops” when calcium was insufficient and damaged kernels by “hallow heart” when boron was not enough. Therefore, to ensure sufficient calcium and boron for the growing seed recommendation to apply these nutrients early on in the season, beginning flowering to beginning pegging, is generally accepted by all peanut specialists. Manganese deficiency is easy to see and correct for when it happens. Sulfur might have become needed in peanut production, but timely gypsum application takes care of both, calcium and sulfur. Some specialists talk about zinc toxicity. I personally have not seen one in Virginia, but it does not mean it may not be. Having soil tested every year always helps. Recommendations are to keep soil pH at 6.2 when soil-test zinc is 10 pounds per acre and 6.6 if zinc is 40; but then more manganese is needed.

Protection wise, there were many talks about PPO herbicide and neonicotinoid insecticide resistance, and removal from the market of Tilt Bravo™ because of export concerns. An early tank mix of Alto 100 SL (5.5 oz) and Bravo WeatherStik (1.0 pint) can be used instead of Tilt Bravo™. Velum Total by Bayer has proven good control of thrips in peanut tests in Virginia and North Carolina. Also an improved tank mix version of Provost has become recently available as Provost Opti by Bayer.

The bottom line, 2016 is going to be under El Niño influence, with warm weather in central Pacific; wet and cool fall and winter, dry and warm spring, and dry late summer. Ron Heiniger, corn specialist at the North Carolina State University, thinks 2016 is going to be an excellent year for corn production, but what about peanut? Warm and dry spring, dry late summer, and cool and wet fall? Oh no, not again! Maybe a good option is to get ready to plant early, if indeed the temperature is over 65 °F or better 68 °F; plant Wynne, Sugg, Gregory, and CHAMPS (I know there are still a few growers that grow those) only if irrigation is available; plant at least two cultivars in dryland, Bailey and Sullivan.

2016 Wheat and Growing Degree Day Accumulation

Previous work in VA has demonstrated that we “normally” accumulate around 1350 GDD from planting to jointing in wheat in Virginia.  The warm weather this year has been anything but normal and so I don’t think we can follow that guidepost this time.

Our wheat varieties require at least 30 days of temps less than about 42 degrees to vernalize.  In most areas we made that threshold of at least 30 days between what I considered to be a normal planting date for the region and the end of the year.  For example near Richmond a crop with planting date of Oct 20 would have experienced 31 days with lows below 42F before January 1.  Other researchers have reported that wheat requires around 700 GDD after the vernalization threshold has been reached.  This seems pretty reasonable for use in VA.  When comparing to the 30 year average temperatures for central VA, 700 GDD accumulated from January 1 predicts a jointing date of March 20.   I believe this matches well with historical observations for the crop

Below is a figure showing GDD accumulated at 3 sites in eastern VA since January 1, 2016.

wheat_GDD_16

Yep – it’s been warm.   About 40% greater GDD accumulation at this point in the year compared to the long term average.  Normally we are accumulating about 5.75 GDD/day this time year.  This year it’s over 8.

I honestly don’t what this means for us in terms of wheat development.

If the temperatures return to the 30 year average tomorrow the warm weather thus far would have relatively little impact. Instead of predicting a jointing date of March 20 (700 GDD) we would get to 700 GDD on about March 15.

The 14-day forecast I’m looking at has us continuing to stay warmer, however.

If we stay near the current trend through jointing, it’s possible we will be 3 weeks ahead of the long term average.

I won’t pretend to be able to forecast the coming weather, but I think it’s likely that things may begin to happen very quickly with the crop.
This may impact our ability to split N applications as driving over wheat that’s already jointed damages the growing point.  I suspect weeds, insects, and disease are also responding to these warmer temperatures.  Small weeds are going to get to be big weeds sooner this year.  Diseases like powdery mildew have already been found in the crop in some places.  Scouting early and often may prove a valuable investment.

Peanut Variety and Quality Evaluation 2015 Report

Due to suitability to the environmental conditions and existence of a strong peanut industry tailored to process primarily the large-seeded Virginia-type peanut, growers in Virginia, North Carolina, and South Carolina generally grow Virginia-type cultivars. In the view of a common interest in the Virginia-type peanut, the three states are working together through a multi-state project, the Peanut Variety Quality Evaluation (PVQE), to evaluate advanced breeding lines and commercial cultivars throughout their production regions. The objectives of this project are: 1) to determine yield, grade, quality, and disease response of commercial cultivars and advanced breeding lines at various locations in Virginia and the Carolinas, 2) develop a database for Virginia-type peanut to allow research-based selection of the best genotypes by growers, industry, and the breeding programs, and 3) to identify the most suited peanut genotypes for various regions that can be developed into varieties. This report (http://www.pubs.ext.vt.edu/AREC/AREC-164/AREC-164.html ) contains agronomic and grade data of the PVQE tests in 2015.

Stakeholder input on Virginia’s State Pollinator Protection Plan

The following advisory is posted on behalf of Dr. Hunter Frame:

I want everyone to check out this letter for stakeholder input on the pollinator protection plan that is being developed by VDACS. So for the cotton producers the nearest meeting will be on February 22 from 6-8 pm at the Tidewater Agricultural Research and Extension Center in Suffolk, VA. This is an important issue that needs to be discussed and solutions need to be developed so no tools for producers are lost and bees/beekeepers are able to thrive next to cotton and other crops! Look forward to seeing everyone there!

http://www.vdacs.virginia.gov/pdf/pollinatorprotectionplanletter.pdf

26th Annual Eastern Shore of Virginia Ag Conference & Trade Show

The Eastern Shore of Virginia Ag Conference & Trade Show is on! We are snow free, and looking forward to a great event on January 26 and 27, 2016. The event will take place at the Eastern Shore Community College Workforce Development Center in Melfa, VA. The full program can be found at: http://issuu.com/esarec/docs/flipbookfinal/1. We have been approved for Certified Crop Adviser (CCA) CEU credits (details at: https://www.dropbox.com/s/f34f3spg4quni7a/CCA_Credits_Handout_2016.pdf?dl=0), Virginia Nutrient Management Credit (1 credit), and Virginia Pesticide Recertification credits (information in the program). See you there! Directions can be found at: http://es.vccs.edu/about/mapdirections/.ESCC

Eastern Shore Ag Conference & Trade Show

Join Virginia Tech, Virginia Cooperative Extension, the Virginia Association of Potato and Vegetable Growers, and Industry to hear updates, research information, and innovative products for grain, oilseed, and vegetable crops important to Virginia’s Eastern Shore on January 26 and 27, 2016. This event is free and open to the public. Announcements concerning conference updates, weather delays and/or closings, etc. will be made at: https://www.facebook.com/EasternShore.Soils. Highlights of the program can be found in the attached flyer.

Ag Conf Press Release 2016