Temperature requirements for the development of Diabrotica virgifera zeae
Temperature requirements for Diabrotica virgifera zeae (Mexican corn rootworm – EPPO A1 quarantine pest) were studied in the laboratory and compared with those of Diabrotica virgifera virgifera (Western corn rootworm - EPPO A2 quarantine pest). Development of immature stages of D. virgifera zeae was investigated at 8 temperatures (15, 18, 21, 25, 27, 30, 31.5, 33;°C). Development from egg hatch to adults was only completed for temperatures between 15 to 30 °C. Larvae failed to complete the third instar at 31.5 °C and 33 °C, and survival of both sexes declined above 27 °C. Development from egg hatch to adult emergence was fastest at 30 °C (≈25 days) and slowest at 15 °C (≈105 days). The best temperature range for development and survival was between 21 and 27 °C (for D. virgifera virgifera, this range goes from 21 to 30 °C). It was observed that males emerged only 1 or 2 days before females (whereas D. virgifera virgifera males emerge several days before females). The development threshold was estimated at 10.3 °C (9° C for D. virgifera virgifera), and development from egg hatch to adult was estimated to take 473 degree-days (434 for D. virgifera virgifera).
Sources
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Woodson, W.D.; Chandler, L.D. (2000) Effects on development of immature Mexican corn rootworm (Coleoptera: Chrysomelidae).
Annals of the Entomological Society of America, 93(1), 55-58.
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