Rootworm Realities
Emily Unglesbee DTN Staff Reporter
Fri Apr 11, 2014 04:10 PM CDT

LAWRENCE, Kan. (DTN) -- Along with the flowers, budding trees and April showers, spring brings a less welcome development for Corn Belt farmers: Continued spread of Bt-resistant western corn rootworm.

Three more Illinois counties --- Sangamon, Mercer and McDonough -- have confirmed western corn rootworm populations resistant to Bt-hybrids that express the Cry3Bb1 protein. University of Illinois entomologist Michael Gray announced the latest confirmations in a university pest bulletin on April 3. Since the first documented case of Bt-resistant rootworm in 2009 in Iowa, confirmed and suspected cases of it have surfaced throughout the Corn Belt.

In his announcement, Gray ...

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