University of Georgia
Extension Peanut Agronomist
The Southeast’s breeding programs have released some outstanding cultivars with various characteristics. Based on acreage planted in 2009 to produce seed for 2010, the Southeast will be planted primarily in these eight cultivars: Georgia-06G, Florida-07, Tifguard, Georgia Greener, Georgia-07W, Georgia-02C, Georgia Green and AP-4.
Use the Peanut Rx program to determine how each of these cultivars fit into a disease management program. Three specific problems in which producers can utilize genetic resistance as the backbone of their management program include peanut root-knot nematode, CBR and white mold. The best cultivar options for battling these problems are: Tifguard for fields with a history of peanut root-knot nematode; Georgia-02C or Georgia Greener for fields with problems with CBR; and Georgia-07W for fields with heavy pressure from white mold.
Texas A&M University
A successful season-long weed control program includes the proper use of yellow herbicides. Products like Sonalan and Prowl offer tremendous value, provide control of grass and broadleaf weeds and establish a good residual-based early season component. In Texas, we feel that diligent use of yellow herbicides has helped prevent resistance that has plagued other states. It is imperative to continue to properly use these and other products to minimize the potential development of weed resistance.
Yellow herbicides can be incorporated mechanically or with irrigation (chemigated or applied and watered in). For irrigation, make sure the entire pivot is applying at least 0.75 to one inch of water. These water-insoluble products take a lot of water to properly incorporate into the weed-seed zone. Used properly, yellow herbicides are a real benefit.
North Carolina State University
Start with a clean, weed-free crop. Reduced tillage requires a burndown that eliminates winter weeds and emerged summer annuals. Glyphosate and paraquat are key components of burndown programs, and in cases of glyphosate resistance, alternatives such as 2,4-D or dicamba and residual herbicides may be needed. Keep planting intervals in mind to reduce injury. If you are fumigating for CBR, burndown before planting may be an issue, especially if planting is delayed and weeds emerge.
In conventional tillage, uniform incorporation of preplant herbicides and timely application of preemergence herbicides behind the planter are essential. Good control early takes the pressure off of postemergence herbicides and increases flexibility in timing of application. Avoid situations where more than two postemergence applications are made, especially with PPO inhibitors.
Most of the new runner varieties are large-seeded and don’t require gypsum, but do require more calcium than Georgia Green. Auburn University’s Soil Testing Lab soil test calcium level for small runners, such as Georgia Green, is 300 pounds per acre in the top two to three inches of soil. The recommendation for large-seeded varieties is 500 pounds per acre, which is from their old recommendation of Virginia-type peanuts.
Taking a soil sample in fields before planting would allow for time to apply Hi-Cal lime before planting to raise the pH and the calcium level in the soil by pegging time, giving the producer more bang for the buck. If the pH is too high to apply lime and the calcium level too low, then apply gypsum at early pegging to prevent leaching of this soluble product.