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Field and laboratory studies were carried out to evaluate three eggplant cultivars, long black (Anan), white long (Soma) and spherical black (classic) for their relative susceptibility to spotted spider mite, Tetranychus urticae Koch, whitefly, Bemisia tabaci (Gennadius), aphid, Aphis gossypii Glover and Jassid, Empoasca lyb ica de-Berg infestation. The obtained results showed that spherical black cultivar was the most susceptible to spider mites, aphid and whitefly, while black cultivar was lowest level infestation by the tested sucking pests.Obtained data cleared that there were significant differences between eggplant cultivars and piercing sucking pests, which may be affected by plant leaf phytochemical constituents; total amino acids, total lipids, total carbohydrates, sodium, potassium, phosphorus, calcium, chloride and nitrogen, therefore, sodium, potassium, chloride, magnesium contents were negatively correlated with population density of different piercing sucking pests. On the other hand, total amino acids, lipids, carbohydrates, protein and nitrogen positively correlated with different piercing sucking pests. INTRODUCTION Eggplant, Solanum melongen L. is one of the most important solanaceous crops. It is a good source of nutrients, minerals, antioxidants, vitamins, dietary fiber and body building factors and proteins (Matsubara et al., 2005). One hundred grams of fruit contains 0.7 mg iron, 13.0 mg sodium, 213.0 mg potassium (Nonnecke, 1989), 12.0 mg calcium 26.0 mg phosphorus, 5.0 mg ascorbic acid and 0.5 International Units of vitamin A and provides 25.0 calories (Tindall, 1978). Ninety percent of production comes from five countries; china produces 24.5 million tons followed by India 10.6 and Egypt come in the third by 1.2 million tons per year. About 1.7 million hectares are devoted to cultivate eggplant in the world (FAO, 2010). Eggplant grows in temperate climates, so it is subjected to many pests as the two spotted spider mite, Tetranychus urticae Koch, the whitefly, Bemisia tabaci (Gennadius), Jassid, Empoasca lybica and aphid Aphis gossypii (Glover). These pests cause great damage to the plants. So, the screening of susceptibility of different cultivars against pests may help in the breeding of resistance varieties. The chemical constitution of the host plant may influence fecundity, egg viability and the mortality and the rate of development of immature stages as the leaf structure has been showed to be related to pest damage or to symptoms commonly associated with damage. The highest density of phytophagus mites occurred on leaves which, in addition to having higher total nitrogen content, had a thicker palisade mesophyll, (van de Vrie., 1972; Iskander et al., 2002; Abou Zaid et al., 2012).Although host plant

journal of plant protection and pathology /journal of plant protection and pathology

FIELD AND LABORATORY STUDIES ON THREE EGGPLANT CULTIVARS TO EVALUATE THEIR RELATIVE SUSCEPTIBILITY TO SOME PIERCING SUCKING PESTS WITH RELATION OF LEAF CONSTITUENTS