Issue No. 14, Article 2/June 25, 2004
Corn Rootworm Larval Injury Reports Continue
Reports of corn rootworm larvae feeding on roots continue to come in. Injury in first-year cornfields has also been reported in Logan, Sangamon, and Shelby counties. We have now had our first report of western corn rootworm adults. Shortly after the Bulletin went to print last week, Joe Spencer, with the Illinois Natural History Survey, and Darren Bakken, a graduate research assistant in the Department of Crop Sciences, found western corn rootworm adults on separate occasions in experimental plots in Urbana. Historically, western corn rootworm adults are more commonly seen after the fourth of July holiday. Adults initially feed on corn leaf tissue, which does not generally cause economic injury. As cornfields begin to tassel, western and northern corn rootworms feed in silk tissue and pollen. Future articles will provide management strategies and discussion to prevent excessive silk clipping and future yield loss. Let us know when corn rootworms begin to emerge in your area.
Adult western corn rootworm.