Worms
A farmer near Norway, SC observed numerous armyworms actively feeding in peanut. Early Junly is slightly early compared to when we typically see them, which provides a healthy reminder of the value of scouting our fields. Based on our recent weather patterns including dry stretches, I would caution against the use of products that include a pyrethroid (Besiege, for example) and would instead recommend chlorantraniliprole products such as Prevathon, Coragen, Vantacor, Shenzi, etc., or methoxyfenozide + spinetoram (Intrepid Edge). Our guiding threshold for foliage feeding caterpillars is 8 per row foot in healthy canopies and 4 per row ft in struggling or stressed and unlapped canopies.
Carpetweed
The following is a recommendation from Dr. Marshall regarding carpetweed in peanut:
After thinking about this, Pursuit at 4 fl oz/A + NIS would control carpetweed. The label says it will control larger carpetweed. Cadre only controls up to 2” carpetweed. There is an 85 preharvest interval for Pursuit which would put it about 60 days after planting. Pursuit would also give residual control of carpetweed. They can also mix 2,4-DB to improve control of larger carpetweed. Typically, carpetweed is not a competitive weed with most crops so there should not be any yield consequences of this weed.
Zidua timing
Zidua is compatible to be applied up to R3 (swollen peg) growth stage. The potential concern of applying the product at later growth stages is related to potential pod malformation.
Save the date
Thursday, September 10 for the Peanut, Cotton, Vegetable, and Fruit Field Day at Edisto Research and Education Center. Additional details to come as the day draws near.
Dan Anco
Extension Peanut Specialist and Associate Professor
Department of Plant and Environmental Sciences
Clemson University – Edisto Research and Education Center
64 Research Road
Blackville, SC 29817
630-207-4926 cell