الفهرس 
Cultivars effects on insect pest densityOnly 14 pages are availabe for public view
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Abstract
The common bean, Phaseolus vulgaris L is an important vegetable and pulse crop in Egypt. It is attacked by various insect/mite pests. In the present study, field experiments were conducted on Copy, Polesta and Manga common beans varieties with the objective to monitor the population dynamics of their insect/mite pests and associated predators and the relative attraction of these varieties for major insect/mite pests. The influence of temperature and relative humidity on the population dynamics of insect/mite pests and predators was determined. In addition, the efficacy of different foliar insecticide treatments was evaluated against insect/mite pests on P. vulgaris cultivars and effects of these insecticides on total pod yield. All experiments were conducted at Etay EL-Baroud Agriculture Research Station, EL-Beheira governorate, Egypt during summer and winter growing seasons (2013-2015). Pests observed during the summer and winter cropping seasons were Bemisia tabaci, Aphis gossypii, Empoasca decipiens, Thrips tabaci, Tetranychus urticae and Liriomyza trifolii. In summer, B. tabaci was detected in March and peaks in May on the three cultivars. In winter, it was detected in October and peaks in November. In summer, A. gossypii peaks in May. In winter, it peaks in November. E. decipiens peaks in May during summer while in winter it peaks in November. T. tabaci peaked in June in summer, while in winter it peaks in December. In summer, T. urticae peaks in May, while in winter it peaks in December. L. trifolii peaks twice in May while in winter it peaks in November. The cultivars Copy and Polesta were the most susceptible varieties to pest infestation, while the cultivar Manga was the least susceptible. In winter cropping season, the cultivars Copy and Manga were more susceptible to all insect pest infestation than Polesta cultivar. In the most cases, all insect/mite pests associated positively with temperature average in summer season and negatively correlated in the winter season. Meanwhile, most pests associated negatively with RH% in both summer and winter seasons. In summer, B. tabaci was the most common pest on all cultivars followed by T. tabaci, A. gossypii, E. decipiens, T. urticae and L. trifolii. Unlike summer, L. trifolii was the most common pest in winter followed by A. gossypii, B. tabaci, T. urticae and E. decipiens. Prevalent predators found were, Orius albidipennis, Coccinella undecimpunctata, chrysoperla carnea, Syrphus ribesii and spiders. In summer, predators were detected in May and June while in winter they were active in October through December. The relative efficacy of Thiamethoxam, Dimethoate Abamectin, kz. and Clove oils as foliar spray was evaluated in the field. Thiamethoxam was the most effective against B. tabaci, A. gossypii, T. tabaci and L. trifolii. Abamectin was superior to other pesticides in controlling T. urticae. Dimethoate, Thiamethoxam and Abamectin were superior in reducing E. decipiens population. Dimethoate application resulted in the highest pod yield/plant followed by clove and Thiamethoxam.