Peanut scouts in Suffolk today found fields with above threshold numbers of corn earworm/tobacco budworm (4 per row foot). Fields previously treated recently with chlorpyrifos may be at higher risk because they have fewer beneficial predators.
Black beat cloths can aide in sampling. However, shaking and slapping plants will dislodge worms onto soil for easy counting. Make sure and check around the base of the plant when using either method.
Feeding damage shows up in the form of holes in foliage. Worms may also feed on terminals and flowers so scouting for damage alone is not recommended. Peanuts can lose a lot of leaf material without losing yield, but drought-stressed or herbicide injured plants are at higher risk for yield-loss. Do not spray unless necessary. Recent dry weather in combination with broad-spectrum insecticides can flair spider mites.
Pyrethoids are a common choice for earworm control in Virginia and most products can be tank mixed with a fungicide to save money. Always read and follow label instructions. Pyrethroids are losing efficacy against earworm and we have experienced spray failures in other crops (soybean, cotton, sweet corn). Budworm have been resistant to pyrethroids for some time. You will not be able to distinguish these two species in the field. Refer to NCSU video for details. Do not expect complete control of large worms or high populations. Alternative products labeled in peanut include Prevathon, Besiege, Steward, Radiant, Intrepid Edge, and Blackhawk. A list of products and rates is included in Virginia Tech’s Pest Management Guide.
Especially with all the wet weather we have been having in much of the region, it is time to start thinking about peanut diseases. We do not typically see a lot of disease until the canopy closes, but once the vines are touching the environment within the canopy becomes favorable for disease development. Leaf spot programs should be applied beginning at early beginning pod then according to a calendar-based (usually 14 day intervals) or advisory based program. The leaf spot advisory for Virginia can be found at https://webipm.ento.vt.edu/cgi-bin/infonet1.cgi. Some keys to a successful leaf spot fungicide program include:
- Make the first application at the appropriate time (not too late).
- Apply fungicides regularly before leaf spot outbreaks are observed (once disease is present it is difficult to slow down the epidemic).
- Stick to a regular calendar-based program or utilize leaf spot advisories.
- Be mindful of fungicide resistance management (rotate chemistries and/or tank mix with chlorothalonil).
- Scout for soil-borne diseases and utilize fungicides with activity against both leaf spot and other target diseases (e.g. for both late leaf spot and southern stem rot control use a product such as Provost, Elatus, Priaxor, etc.).
Data are currently being collected to improve both leaf spot and Sclerotinia advisories and to develop a southern stem rot fungicide advisory for peanut. This is being conducted through the Peanut iPiPE program. The Integrated Pest Information Platform for Extension and Education (iPiPE) is a program that allows farmers and extension agents to share information with each other through the internet. iPiPE works by allowing users to enter pest data such as presence and severity of diseases or insects. This data will be shared with everyone in an effort to create a more precise system of pest monitoring and management. The Plant Pathology program at the Virginia Tech Tidewater AREC is leading the Peanut iPiPE and using it to improve disease advisories based on observations of disease onset in peanut fields throughout the region. Two undergraduate interns are currently scouting for peanut diseases in the region, and they will enter disease observations into the iPiPE database.
Disease and pest observations can be easily uploaded to the database through a mobile phone app or the online platform. We are encouraging anyone who scouts peanuts to help us collect disease observations. To become a participant, you can request an iPiPE account by visiting the iPiPE platform (http://www.ipipe.org/). Detailed information on the iPiPE platform and a user guide for the mobile app can be downloaded below. Alternatively, you can email disease observations to Dr. Hillary Mehl (firstname.lastname@example.org). In addition, if you are located in southeastern Virginia or northeastern North Carolina and are interested in having your peanut crop scouted for diseases by our iPiPE interns, please contact us.
Peanut iPiPE Stakeholder Card 2018
Peanut iPiPE Users Guide 2018
For more information or questions regarding the Peanut iPiPE contact Dr. Hillary Mehl (email@example.com).
A summary of field crop disease and nematode management trials from 2017 is now available. Results for applied research on wheat, corn, cotton, peanut, and soybean can be downloaded below.
Research data, such as those here Seeding Rate-May 2018, showed that saving seed at planting does not return high yields or economic profit. To achieve high yields, we recommend planting 5 or 6 seeds per foot of row, assuming a germination of 80% and above. This is in particular necessary for large seeded cultivars like Emery and Wynne, and under irrigation. If germination is lower than 80%, which may be the case this spring for some seed lots of Wynne and Sullivan, 6 to 7 seeds are safe to plant but nothing above that. At least, we have not recently tested or heard of a benefit to increase the seeding rate above 7.
There are concerns that imidacloprid-based insecticides for thrips control may negatively affect Rhizobia in inoculants when tank-mixed and applied in the furrow when plating peanut. As we are just a week (or less) from starting peanut planting in Virginia, I thought this issue be addressed for the farmer’s peace of mind if they decide to mix Optimize Lift inoculant with Admire-Pro insecticide for in-furrow seed treatment. I personally have not looked into this issue before, because we have not seen any effects in research plots or received complaints from farmers. However, we will research this aspect in 2018.
Meanwhile, colleague Dan Anco, Peanut Specialist at Clemson University, tested the effect of different tank-mixtures for in-furrow applications on the nodule number and peanut yield in 2015 and 2017. Graciously, Dan shared this information included in the In_furrow tank mixes tables. The results clearly show no effect of mixing Optimize Lift with Admire-Pro on peanut yield in both years (Tables 1 and 2), even when the number of nodules from this mixture appeared to be reduced by the use of Admire-Pro in 2017 (Table 2). David Jordan, Peanut Specialist at North Carolina State University, reported similar findings Peanut Science Inoculant CFTGM Peanut Inoculant.
The Peanut-Cotton Infonet is up and running for the 2018 growing season. As in previous years, the website will provide:
- Maximum, minimum, and average air temperatures
- Average soil temperature at a 4 inch depth
- Daily and accumulated (from May 1) peanut heat units
- Daily and accumulated (from May 1) cotton degree-days
- Daily and total seasonal (from May 1) rainfall
- Last effective spray date for peanut leaf spot
- Sclerotinia blight risk
- Frost advisory (from September 25th to completion of harvest)
The web address has changed slightly and the website can be found here.
Soil temperatures in southeastern Virginia have been cool over the past couple of weeks (average less than 60 °F), and cool, wet conditions in some fields will favor seedling diseases in early planted crops. A warming trend over the next week will hopefully result in more favorable planting conditions towards the beginning of May.
For questions or concerns regarding the Peanut-Cotton Infonet throughout the growing season, contact Dr. Hillary Mehl (firstname.lastname@example.org).
The 2017 PVQE agronomic and grading results are available here https://pubs.ext.vt.edu/AREC/AREC-231/AREC-231.html. In 2017, 25 peanut breeding lines from the North Carolina State University’s Peanut Breeding program were tested and compared with five commercial cultivars at five locations in Virginia, North Carolina, and South Carolina. At two locations, two digging dates were performed, bringing the number of testing environments to seven. Data include the 2017 released cultivar ‘Bailey II’ tested as line ‘N12008olCLSmT’. Bailey II is a Virginia-type line derived by backcrossing the high oleic seed oil trait patented by the University of Florida into the cultivar ‘Bailey’. Bailey II has approximately 44% jumbo and 43% fancy pods, and seeds with tan seed coat averaging 600 seed lb-1. Bailey II is partially resistant to three of four major regional diseases: leaf spot, Sclerotinia blight, and Tomato Spotted Wilt virus, but it should be considered susceptible to Cylindrocladium black rot. Bailey II has bright pods and flavor comparable with runner-type standards. Yields and the number of days to maturity are similar with Bailey (145 days). In PVQE trials, Bailey II out yielded the popular Bailey in all years of testing.
The 2018 Peanut State Production and Marketing meeting will be held at Paul D. Camp Workforce and Development Center, Franklin, VA, on February 14. Here the program is available. Agenda for the peanut meeting Please make sure to attend this meeting offering important updates on agronomy, varieties, and pest management that will help growers make research based decisions for a successful 2018 peanut growing season.
Looking forward to see you there.
American Peanut Research and Extension Society (APRES) will held its annual meeting and the 50th anniversary at the Doubletree Hotel in Williamsburg, VA, during July 10 through 12. The “Early Bird” Registration fee is $250 for members; spouses and children attend free. APRES has secured a group hotel rate of $129/night and a few per diem rooms at $91/night. The registration and the official call for papers are open, and complete details can be found on the APRES website www.apresinc.com.
As every year, Bayer CropSciences is sponsoring the Peanut Education for Excellence Program as part of the American Peanut Research and Education Society (APRES) annual meeting. They also fully fund the participation of one Agent at the annual meetings. The agent will have to submit an abstract and make an oral presentation in the Extension/Education section of the meeting about extension and technology transfer programs implemented for peanut production in their counties. The deadline for abstract submission is March 31. In collaboration with the VA Peanut Board, I will continue to explore more funding opportunities to increase Agent participation at this important research and education meeting on peanut production.
I encourage all Extension Agents with peanut responsibilities to use this opportunity and participate at the 2018 APRES meeting.
The federal labels for XtendiMax® herbicide with VaporGrip® Technology (Monsanto), Dow DuPont ® FeXapan® herbicide Plus VaporGrip® Technology, and Engenia® Herbicide (BASF) now require additional training beyond a Pesticide Applicator’s License prior to use of these products “over the top” of dicamba-tolerant soybean or cotton. Training for 2018 will be provided by the registrants of the products (BASF, Monsanto, and Dow DuPont).
Agents/dealers interested in scheduling a training in their area or having a company representative deliver the training at an already scheduled meeting should contact the following company representatives:
If you schedule a training with either BASF, Dow DuPont, or Monsanto, I would encourage you to make the other companies aware of the training planned in your area. That way, the companies can better coordinate their efforts to reach as many applicators as possible. Also, training by any of the three registrants will cover all dicamba products labeled for in-crop use to dicamba-tolerant soybean or cotton (applicators do not need to take training from the registrant of the specific dicamba product they intend to use).
In lieu of the face-to-face trainings, the companies also plan to have a web-based training that will satisfy applicator training requirements. Michael and I feel the face-to-face training will better prepare the applicators for the off-target challenges of dicamba. Web-based training can be used as a last resort if a grower is unable to attend face-to-face training. The following websites offer more information on web-based training:
There are a few trainings scheduled for the area. See the link below for an announcement from Monsanto for two training sessions in Suffolk, VA on Wednesday January 31st. BASF will be training applicators at the Virginia Grains & Soybean Conference (http://www.virginiagrains.com/annualconference/). The BASF training for this meeting is schedule for Wednesday February 21st at 12:00pm. I anticipate both companies to have other training; Michael and I will keep you updated as we receive word. Please help spread the word on these trainings, as many growers still do not know that training is required. Also,I would encourage you and your applicators to pre-register for the events so folks can plan accordingly.
With that said, feel free to reach out to Michael or me if you have any questions or concerns.
Monsanto Dicamba Training Announcement