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Issue No. 12, Article 1/June 12, 2009

Corn Rootworm Larval Hatch Reported

Three entomologists at Purdue University have confirmed that the hatch of corn rootworm larvae is underway in west-central Indiana. Christian Krupke, John Obermeyer, and Larry Bledsoe estimated that the hatch began on June 1 for this region of Indiana. Degree-day accumulations (base 52° F) from January 1 to June 7 for Champaign, DeKalb, Monmouth, and Springfield were 444, 289, 438, and 884, respectively. Approximately 684 to 767 degree-days are required for 50% of corn rootworm larvae to complete their annual hatch. Over the next 2 to 3 weeks, corn rootworms will continue to hatch, subjecting corn root systems to larval injury. Damage to late-planted corn may be more severe due to the overall smaller root system exposed to corn rootworm feeding. If you observe significant corn rootworm injury, please let me know.--Mike Gray

Mike Gray

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