الفهرس 
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Abstract
The present work was conducted to carry out survey and seasonal abundance of dominant piercing-sucking species (aphids, leafhoppers and whitefly) infesting certain cruciferous and solanaceous vegetable plants (cabbage, cauliflower, eggplant and pepper). A) Aphid insects under this study were: Aphis gossypii (Glover), Brevicoryne brassicae (Linnaeus), Myzus persicae (sulzer) and Lipaphis erysimi (Kalt) were collected. B) According to leafhoppers: Empoasca decipiens (Paoli), Empoasca decedens (Paoli), Cicadulina china (Ghauri), Balclutha hortensis (Lindberg), Empoasca lybica (Deberg) andCirculifer tenellus (Baker) were collected . C) Bemisia tabaci (Gennadius) were also present. The results clearly indicated that significant and insignificant correlation coefficient and partial regression were obtained between the numbers of the aforementioned insect species and mean temperature, relative humidity and light intensity. The results showed that: yellow California pepper, Back Balady eggplant, Japanese S-O-X cabbage and Grapho cauliflower varieties proved to be the least susceptible for aphids, leafhoppers, and whitefly species infestation. Also, results of chemical content indicated that positive relationship was recorded between protein and carbohydrate contents in all plant varieties and aphids, leafhoppers, and whitefly infestation, while it was reverse relationship between the aforementioned species infestation and pH values. We studied the biology (duration of nymphal development, natality and total longevity) of B. brassicae when reared on cabbage leaves under laboratory conditions. B. brassicae has the ability to transmit cabbage necrotic yellow virus (CNYV).