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Seasonal abundance of the oleander aphid, Aphis nerii Boyer de Fonscolombe and its associated parasitoids on duranta plants were studie in Zagazig and Mansoura during the three seasons 2004/05, 2005/06 and 2006/07. Obtained data revealed that: A. nerii infestation of duranta started by late September and early October, respectively. It continued to late March in the three season. The aphid numbers ranged between 10.88-48.04, 9.40-38.16 and 8.44-39.52 individuals/leaf, respectively in Zagazig during the three seasons. While, in Mansoura the infestation started earlier in the first half of September. It continued to early March. The aphid numbers ranged between 16.08-52.16, 15.72-37.56 and 14.00-41.00 individuals/leaf, respectively during the three seasons. In Zagazig, the aphid abundance showed three peaks in the three seasons of study. The mean numbers of aphids/leaf was 25.64, 25.04 and 22.75, respectively during the three seasons, meanwhile in Mansoura the aphid abundance showed three peaks in first season, four peaks in second season and two peaks in third seasons. The mean numbers of aphids/leaf were 26.63, 24.91 and 24.83, respectively during the three seasons. Five hymenopterous parasitoids, Diaeretiella rapae (M`Intosh), Aphidius sp. (Aphidiidae), (primary parasitoids) Pachyneuron sp. (Pteromalidae), Alloxysta sp. (Cynipidae) and Aphidencyrtus sp. (Encyrtidae) (Hyper parasitoids) were recorded.. D. rapae was the most dominant one, where it occupied 86.68 and 79.57 %, while, Aphidius sp. was 13.32 and 20.43 % in Zagazig and Mansoura, respectively during the three seasons of study. Pachyneuron sp. occupied 52.13, 61.62 %, while Aphidencyrtus sp. was 26.95, 21.4% and Alloxysta sp. was 20.92 and 16.97 % in Zagazig and Mansoura, respectively during the three season of study. Total means of parasitism rates of primary parasitoids; D. rapae and Aphidius spp. were 9.77, 8.69, 12.66 % and 3.39, 7.32, 7.34 % in Zagazig and Mansoura during the three seasons, respectively.

journal of productivity and development/journal of productivitiy and development

SEASONAL ABUNDANCE OF THE OLEANDER APHID APHIS NERII BOYER DE FONSCOLOMBE (HOMOPTERA, APHIDIDAE) IN RELATION TO THE PRIMARY AND HYPER-PARASITOIDS ON DURANTA IN EGYPT.