الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The thesis aims to use some agricultural operations to reduce the numbers of some pests that affect the cotton crop, especially piercing sucking pests, in order to reduce the use of pesticides. Results: The results obtained can be summarized as follows: First: The effect of some agricultural operations on the number of sucking piercing insects and the associated predators: The results showed that the maximum population of aphids was by treating the entrapment, whereas the maximum number for both jasid, red spider and whitefly (insect for whole and incomplete phase) for fertilizer treatment was N: 2P: K, while the maximum number of predators for fertilizer treatment was N: P: 2K. While the lowest number of insects mentioned previously, as well as predators of fertilizer treatment N: P: K for both seasons of study. The mean population for aphids was the highest and the mean for the red spider population was the lowest, under fertilizer treatment N: P: K during the two seasons of the study. The mean overall population of aphids was the highest and the mean overall population for both the red spider and predators was the lowest under the two fertilizer treatments N: 2P: K and N: P: 2K during the two seasons of the study. The overall mean for the insect population was the highest during the two seasons of study, while the general average for the predators was the lowest for the 2016 season and the general average for the red spider census for the 2017 season was the lowest, under the treatment of fertilization with spraying of the vegetative and thirsty areas. Second: Studying the change in the number of sucking piercing lesions and the related predators with the change in temperature and humidity: The population of aphids was associated with a positive relationship with both the maximum temperature and relative humidity and a negative and significant relationship with the minimum temperature under all agricultural treatments tested. The jasid insect population under all the agricultural treatments tested was associated with a positive and significant relationship with the maximum temperature and was positive and highly significant with relative humidity and a highly significant negative relationship with the minimum temperature. Correlation of red spider population was positive with maximum temperature and relative humidity and negative with minimum temperature under all agricultural treatments. The whole phase of the whitefly was associated with a negative relationship with the maximum temperature and positive with the lower temperatures, unlike the incomplete phase that was associated with a positive relationship with the maximum temperature and negative with the lower temperature, while both phases were associated with relative humidity with a positive relationship. Predators showed a positive correlation with each of the aphids - jasid - red spider and whitefly (incomplete phase) and negative correlation with the whitefly whole phase under different agricultural treatments. Third: the efficacy of some compounds on some sucking piercing cotton lesions and associated predators: chlorpyrifos and methomyl were the most effective at reducing aphids and other predators than other compounds. The effectiveness of mineral oil was higher on that of jaside insect than other compounds. The results showed that methomyl, mineral oil and chlorpyrifos compounds had a high and medium primary lowering effect on the whole phase of the whitefly, while the effect of the mineral oil compounds and apamectin and chlorpyrifos on reducing the incomplete phase of the whitefly population was below the mean. The abamectin compound was the most effective in reducing the red spider population by comparison with other tested compounds.