Abstract
Temperature thresholds and thermal requirements for development of the stalk borer, Papaipema nebris (Guenée), were determined under controlled conditions. Developmental rate increased linearly with increasing temperature (12.8 to 23.9°C). Developmental threshold temperatures and thermal units (TU) necessary for 50% of the individuals to complete a given stage were: eggs, 8.4°C and 182.6 TU; larvae, 3.7°C and 1397.2 TU; pupae, 6.1°C and 404.0 TU; and total development from egg to adult, 5.1°C and 1946.7 TU. Dates of 50% egg hatch under screenhouse conditions and 50% moth capture by light trap were within 1 and 4 days, respectively, of predicted dates based on laboratory data.

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