الفهرس 
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Abstract
1 The results showed clearly the possibility of using the light traps as a method for monitoring major insects infesting cotton crop and there were eleven species belonging to Family Noctuidae ( order: Lepidoptera ), one species of the Family Gryllotalpidae ( order: Orthoptera ) and one species of the Family Pentatomidae ( order: Hemiptera ) were recorded. Also the data indicated that the strongest peak of the domentan noctuids moths ( S. littoralis, S. exigua, S. latebrosa, A. ipsilon and T. Pronuba) was found in the first and second week of June during the two successive seasons of the investigation. 2 In this study , the effect of certain weather factors on the population density of major insects infesting cotton crop caught by light traps were studied .The data revealed that , temperature and relative humidity had exerted correlation degree varied from slightly positive or negative to highly significant positive on the population density of these insects during the period of study. 3 The data indicated the effecttiveness of pheromone traps in monitoring and control some insects infesting cotton crop . The results showed that the strongest peak of S.litteralis , P. gossypiella , and E. Insulana was found in June for S. littoralis and in August for P. Gossypiella and E. Insulana during the two successive seasons of study. 4 The results of the hand picking population number of egg masses of S. littoralis recorded the strongest peak of this insect occured in June month , the simple correlation between pheromone trap catch and field infestation was positively. 5 The data revealed that, most suitable sowing date for cotton crop was in the mid March, because the lowest infestation of the sucking piercing insects were recorded at this sowing date .6 The obtained results, of the population growth of the pink and spiny bollworms in green bolls in relation to cotton sowing date showed the infestation in the first sowing date was few, while that was moderate and high in both second and third