A common question that I heard this winter was, "If I plant Bt corn, when should I plant it to get the most benefit out of the technology?" During 1996-1998, my graduate student and I conducted experiments at three Iowa locations (Ames, central; Lewis, southwest; and Nashua, north) to determine how Bt corn and non-Bt corn affected egg-laying by European corn borers and subsequent yield differences. YieldGard hybrids (event Bt11) and non-Bt corn were planted at three times: early (April 19-May 6), middle (May 6-May 21), and late (May 18-June 12).
Iowa State University
Rice, Marlin E., "Bt corn performance at different planting times" (2002). Integrated Crop Management News. 1727.
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