Invasive Species Compendium

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Abstract

Temperature effect on postdiapause development and survival of embryos of three species of Melanoplus (Orthoptera: Acrididae).

Abstract

Postdiapause development and survival of embryos to hatch were studied at 10 constant temperatures (12, 15, 18, 24, 27, 30, 33, 36, 39 and 42°C) for 3 species of North American grasshoppers: Melanoplus sanguinipes, M. bivittatus and M. differentialis. M. sanguinipes and M. bivittatus had similar development curves (rate versus temperature) with developmental thresholds of 10.4 and 9.8°C, resp. M. differentialis had a slower development curve, but the developmental threshold was 8.8°C. Even though M. differentialis had a lower developmental threshold, mean hatch days, the time to the first day of hatch, and the respective thermal units were nearly double those of M. sanguinipes or M. bivittatus. Percentage hatch was greater at 26.8°C for M . sanguinipes, at 24°C for M. bivittatus, and at 26.3°C for M. differentialis; thermal death points were reached at 43, 42 and 42.3°C, resp.