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Significance Of Hyper Parasitization Of Primary Cereal Aphid Parasitoids In
Egypt "Hymenoptera, Parasitica"
A.H. El-Heneidy(1) D. Gonzalez(2) P.
Stary(3) and Dalia Adly(1)
(1)Plant
Protection Research Institute, ARC, Giza, P.O. Box 915, Maadi, Cairo,
Egypt
E-mail: aheneidy@link.net
(2)Department of Entomology, University of
California, Riverside, California, USA
(3)Institute of Entomology,
Academy of Science of the Czech Republic
Abstract
Cereal aphids are the major insect pests of wheat in Egypt. A survey of the
most abundant parasitoid species; primary and/or secondary, associated with
cereal aphid species in wheat fields, in four agro-ecosystems in Egypt, was
carried out for four growing seasons 1997/98-2000/2001 to evaluate the
significance of hyperparasitization of primary cereal aphid parasitoids. The
survey revealed the presence of 7 and 7, primary and secondary parasitoid
species. Average percentage of the parasitism by the primar parasitoides did not
exceed 36 % in the four seasons. Aphidius spp. (matricariae and
colemani) and Diaeretiella rapae were the most abundant primary
parasitoid species (represented by 35.9 and 34.3%, respectively). Total
percentage of hyperparasitism in all over the wheat regions ranged between 19.1
and 24.6% and averaged 21.2%. Highest percentage (51.5%) of hyperparasitism was
recorded in the New Valley, whereas the lowest (2.8%) was found in middle of the
Delta. Cynipids were the most abundant secondary parasitoid species (represented
by 76.2%).
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