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Abstract
The present work was conducted to study relationship between different aphid species infesting leaves of some fruit trees (apple, peach, mandarin, navel orange, pear and mango) and its aphidophagous insects (predators and parasitoids) during three successive seasons of 2001, 2002 and 2003, in El-Khattara district, Sharkia Governorate, this study contain the following points:
1. Field studies:
1.1.Survey of aphid species infesting leaves (apple, peach, mandarin, navel orange, pear and mango).
1.2. Survey of its predators and parasitoids during this study .
1.3.Seasonal abundance of different aphid species and its relation by natural enemies under weather factors in El-Khattara district.