Prevention of diapause induction in a Japanese strain of Aphidoletes aphidimyza


Abstract: The aphidophagous gall midge Aphidoletes aphidimyza (Diptera: Cecidomyiidae), adominant natural enemy of aphids, is used in many countries to control aphids in greenhouses.Since developmental arrest during diapause reduces the effectiveness of natural enemies, westudied the effect of photoperiod and temperature on the incidence of diapause in a Japanesestrain of A. aphidimyza by examining diapause induction under different day-length andtemperature conditions. The critical day length for diapause induction was 12.7h at 20°C.Diapause incidence was completely prevented at 30°C, even under a photoperiod of 11L13D.Diapause induction in A. aphidimyza could be prevented by providing light during the scotophasein the laboratory. However, diapause induction was not prevented by providing light for 1h atnight in the field experiments from September to November 2011.

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