Effects of two prey species on the development of Hippodamia sinuata (Coleoptera: Coccinellidae) larvae at constant temperatures
1991
Michels, G.J. Jr | Behle, R.W.
The effects of prey species and constant temperature regimes on the development of Hippodamia sinuata Mulsant were studied. H. sinuata completed larval development faster on corn leaf aphids, Rhopalosiphum maidis (Fitch), than on greenbug, Schizaphis graminum (Rondani), at low temperatures, but no significant differences were evident at temperatures > 20 degrees C. H. sinuata began development at a lower threshold temperature (7.05 degrees C), and required more degree-days (338.63) for development when corn leaf aphids were the prey rather than greenbugs (12.90 degrees C, 259.54). At 25 and 30 degrees C, H. sinuata larvae consumed significantly more corn leaf aphids than greenbugs (both per day and total consumption), whereas significantly more greenbugs were consumed at 20 and 35 degrees C. The results of the studies confirm the importance of corn leaf aphids as an early-season, cool-temperature prey for H. sinuata.
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