Update From Dan Anco in SC Peanut Notes No. 162 2019
James Thomas has found lots of velvetbean caterpillar moths in Estill, Govan, and Ehrhardt. Larvae size is variable from field to field. This is close to a month earlier than usual, which is also what we saw last year. If VBC larvae are small, less than 0.5”, and active damaging feeding is not present from other worms, Dimilin is a very economic preventative option that can prevent small larvae from becoming larger. This would make a good tank-mix partner with a fungicide as the sprayer is going across the field, particularly in those surrounding southern counties. If larvae are larger than 0.5”, populations have become established, or if additional worms are present (fall armyworm/granulate cutworm…), knockdown insecticides would be more effective and quicker. VBC is susceptible to many products including inexpensive pyrethroids. Pyrethroids risk killing beneficials and potentially flaring spider mites, whereas products like Prevathon or Intrepid Edge are safer with beneficials.
Also just a friendly reminder to continue to keep an eye on leaf spot in each field to avoid it throwing us a “surprise party”. We have a lot of effective and new products, but if a field has a short rotation following heavy disease pressure or also had volunteer issues previously, even the most effective products could be up against a challenging situation, especially with susceptible varieties. In those cases, product/MOA rotation and or tightened intervals often help.
Extension Peanut Specialist and Assistant Professor
Department of Plant and Environmental Sciences
Clemson University – Edisto Research and Education Center
64 Research Road
Blackville, SC 29817
803-284-3343 x261 office