Peanut Grower Short Column

— Written By

Short Column Provided for June Issue of Peanut Grower Magazine

Peanut stands are established now and in many cases growers will have applied early postemergence sprays to control weeds that escaped preplant and preemergence herbicide programs and insecticide to control thrips that may have slipped by in-furrow applications of insecticide. In most cases peanut will recover quickly from thrips damage during June.

Keep an eye out for escaped weeds as application to small weeds in most cases provides better results. Also, it is best to apply paraquat within 2 weeks after peanut have emerged but the label does allow for application up to 28 days after emergence. Many fields will be past the 28 day window by the third week of June in the V-C region. If trying to control ALS-resistant Palmer amaranth with additional postemergence sprays, make sure herbicides are applied at a time when Cobra, Ultra Blazer and Storm are most effective (3 inches or less). Many times we apply Cobra or Ultra Blazer with Cadre to get both resistant and susceptible control of Palmer amaranth but keep in mind timing of application needs to be relative to the effectiveness of PPO herbicides.

Many growers will be applying gypsum at this point in the season. We recommend that growers error on being a little late with gypsum rather than too early. Certainly weather conditions can cause problems either way. For example, in 2013 fields became too wet for field operations in late June and those conditions persisted well into July. However, this extreme occurs infrequently. One concern is that early applications of gypsum can be vulnerable to rainfall that washes gypsum from the top of beds when gypsum is applied early and there is limited peanut foliage to “soften” the rain’s energy which allows movement of gypsum into row bottoms.

Southern corn rootworm continues to be a concern for growers in some fields, especially those fields with irrigation. We encourage folks to use the risk index developed in the region to determine if granular Lorsban is needed in each field. Many of our fields are at low risk and we definitely do not want to treat those fields because of potential for spider mite outbreaks. But too, some fields are at risk and should be treated.

Once the operations listed above have been addressed through the month of June and into early July, growers will focus on spray programs for disease, some cleanup of escaped weeds and occasional outbreaks of insects. Of course manganese should be applied in early July as well as boron to make sure kernels develop adequately.

Article first appeared as North Carolina Peanut Note (PNNC-2014-049)

Written By

Dr. David JordanExtension Peanut Specialist (919) 515-4068 david_jordan@ncsu.eduCrop and Soil Sciences - NC State University
Updated on Oct 15, 2014
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