Kansas State University


Extension Entomology

Month: September 2016


–by Dr. Jeff Whitworth, Dr. Holly Schwarting and J.R. Ewing



Many spiders are reaching maturity this time of year and numerous species stretch webs everywhere trying to catch a few insects before cold weather sets in.  Although large, and to many frightening, most are totally harmless and all are beneficial by eating other insects including mosquitos and flies which are currently numerous.






Soybean Pests Update

–by Dr. Jeff Whitworth, Dr. Holly Schwarting and J.R. Ewing

Green cloverworms have moved into the pupal stage, for the most part, and thus have finished feeding on leaves.  There will probably be another generation of green cloverworms so any late planted soybeans may be at risk for defoliation again although it probably not enough to warrant an insecticide application.  Adult bean leaf beetles and stink bugs may also still be present in soybean fields and feeding on beans as long as they are still filling inside the pods, so monitoring should continue until pods are mature.

Sorghum Headworms and Soybean Podworms

–by Dr. Jeff Whitworth, Dr. Holly Schwarting and J.R. Ewing


Most sorghum is at least flowering with much into milk, soft dough and even black layer.  Thus, headworm susceptible stages are mostly past as flowering to soft dough is the time frame for headworm vulnerability.  Once these advanced stages have been reached the head moth will start ovipositing in soybeans.  Soybeans then need to be continuously monitored, as long as there are new pods, for podworm damage and/or smaller podworms.