We often use a general rule that "corn rootworm eggs hatch on June 6." On June 7, Jim Oleson, agricultural specialist, Department of Entomology, dug corn plants from our research plots and placed them in Fromm funnels to extract corn rootworm larvae from the soil. The funnels are made of plastic drink cups and fiberglass window screen that hold the plants and soil over water as they dry. As the samples dry, larvae crawl out and fall into the water below. This facilitates the collection of very small, newly hatched larvae. If you would like more information on how to construct and use the Fromm funnels, instructions can be found at Colorado State University.
Iowa State University
Tollefson, Jon J. and Rice, Marlin E., "Corn rootworm larvae are actively feeding on your corn" (2006). Integrated Crop Management News. 1292.
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