B.t.-hybrids and their non-B.t. isolines were planted on the University of Kentucky, Research and Education Center farm in Princeton, KY during the springs of 1999 through 2002, using no-tillage and standard agronomic practices. In each year, plots were planted on five dates, at two week intervals beginning in mid-April and ending in mid-June. At the end of the season plots were hand harvested for yields and 20 stalks per plot were split and the number galleries and length of galleries was recorded. Bt corn did not provide significant yield differences with early planting dates, but increased yield up to 40 bu per acre with later dates.
Species 1: Lepidoptera Pyralidae Ostrinia nubilalis (European corn borer)
Species 2: Lepidoptera Pyralidae Diatraea grandiosella (southwestern corn borer)
Keywords: Bt corn, planting date
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