–by Dr. Jeff Whitworth and Dr. Holly Schwarting
Spider mites are infesting soybeans relatively early this year in several areas in north central Kansas. These mites damage plants by feeding on individual plant cells, usually starting on the undersides of lower leaves. Under less than ideal growing conditions, these mites can turn leaves brown and cause them to die in a few days. Mite populations can build up quickly and if treatment does become justified please use enough carrier to penetrate into the canopy and reach the undersides of leaves. Also, realize that if using an insecticide to control other pests, the predators will likely be significantly reduced which may allow mite populations to increase. For more information on spider mite management, please see the Corn Insect Management Guide: https://www.bookstore.ksre.ksu.edu/pubs/MF810.pdf