oa African Entomology - The effect of temperature on oviposition behaviour and success of two parasitoids of the Russian wheat aphid, Diuraphis noxia (Kurdjumov) (Hemiptera: Aphididae)



The oviposition behaviour of the parasitoids Aphelinus asychis Walker (Hymenoptera: Aphelinidae) and Aphidius colemani (Viereck) (Hymenoptera: Aphidiidae) parasitizing Diuraphis noxia (Kurdjumov) in South Africa were studied at different temperatures. The developmental time and fecundity of A. colemani were also studied. Aphelinus asychis revealed a more intricate behaviour pattern than A. colemani, resulting in fewer eggs being laid by A. asychis in the same period. Minimum temperatures of 5C and 11.1 C were required for oviposition in A. colemani and A. asychis respectively. A mean fecundity of 316 offspring per female of A. coleman; was recorded, while developmental times of 24.33,11.78 and 10.55 days were recorded at constant temperatures of 15, 20 and 25 C respectively.


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