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The effect of parasitism by Aphidius ervi Haliday (Hymenoptera: Aphidiidae) on development, survival and reproduction of pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae), of different ages was studied in the laboratory. Aphids parasitised when 1 and 2 days old (1 st and 2 nd instar) died at the 4th instar. However, those parasitised when 3 to 6 days old (3 rd and 4 th instar) could reach the adult stage following parasitism and those that were parasitised after 4 days old (late 3 rd instar) were still able to produce progeny. In comparison with the unparasitised aphids, the parasitised aphids had a signifi cantly shorter reproductive period and produced significantly fewer progeny, and thus had significantly lower intrinsic rates of increase, net reproductive rates, shorter generation time and longer doubling time. The potential impact of the parasitoid on host population growth is discussed.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

The effect of parasitism by <i>Aphidius ervi</i> on development and reproduction of the pea aphid <i>Acyrthosiphon pisum</i>