Emergence Pattern of the Sorghum Midge, Contarinia Sorghicola, and Its Parasite, Aprostocetus Diplosidis
Abstract
Seed heads of `DeKalb E-57' sorghum, planted on 26 April, 16 May, and 1 June 1976, were harvested in the soft dough stage and placed in emergence cages to determine the temporal pattern of emergence for the sorghum midge, Contarinia sorghicola (Coquillet), and its parasite, Aprostocetus diplosidis Crawford. Midge emergence began at the end of the milky stage, peaked 5-6 days later, and was complete in 10-11 days. Parasite emergence began 7-8 days after the end of the milky stage, peaked at 12-14 days, and was completed in 18-19 days. The emergence of the 2 insects overlapped from the 7th to 11th day after the end of the soft dough stage, Toxic residues of insecticides, applied to kill emerging adult midges, could be present for 7 days after the end of the soft dough without harming the adult parasites.Downloads
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