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Abstract
Experiments were conducted to investigate the susceptibility of three squash cultivars (Revera, Eskandarany and Mabrouka) to Polyphagotarsonemus latus (Banks) and Bemisia tabaci (Genn.) infestation; relationship between leaf phytochemical components and P. latus and B. tabaci infestation; the population dynamics of the broad mite P. latus and whitefly B. tabaci infesting squash; its response to some surrounding environmental factors (daily mean temperature, daily mean relative humidity and average wind speed); and finally its control by some insecticides For such purpose, trial was conducted at Kaha Plant Protection Research Institute station, Qalubiya Governorate during summer and nili of 2011 and 2012 seasons in the open field Different stages of P. latus and B. tabaci populations showed insignificantly negative correlations with temperature in summer season and positive in nili season. The direction of this relationship may be due to that those pests prefers moderate temperature, while daily average temperature during summer season was 27-31 {u00B0} C and 18.5-30 {u00B0} C during nili season. Relative humidity had opposite results Eskandarany cultivar was the most susceptible cultivar to P. latus and B. tabaci different stages infestations. On the other hand, Revera cultivar was infested with low numbers of P. latus and B. tabaci different stages infestations. Finally, Congest proved to be the most effective pesticide in reducing P. latus movable stages (80.3%), while NeemAzal had the lowest effect (18.9%) on P. latus. Orizon proved to be the most effective pesticide in reducing B. tabaci immature stages (83.6%), while Biosect had the lowest effect (42.86%) on B. tabaci.