Developmental response of Lysiphlebus testaceipes to temperature

The number of days required for development of Lysiphlebus testaceipes (Cre sson) from egg to adult emergence from the aphid mummy was measured at 10, 14, 18, 22, and 26 degrees C, respectively, using the greenbug, Schizaphis graminum (Rondani), as the parasite's host. The threshold temperature for d evelopment was 6.6 degrees C (SE = 0.33), while the degree-day requirement for development was 170 DD (SE = 14.5). The threshold temperature of L. tes taceipes was 3.5 degrees C higher than the average of threshold temperature s of other aphidiid parasitoids of cereal aphids for which published estima tes are available, and 1.8 degrees C higher than the highest threshold temp erature reported for these species. The degree-day requirement for developm ent of L. testaceipes was 100 DD lower than the average degree-day requirem ent for other aphidiid cereal aphid parasitoids.