الفهرس 
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Abstract
The present work has been devoted to study the following points: Phytophagous and predaceous mite families infesting four vegetable crops: eggplants, chili pepper, tomato and common bean. Soil mites under the four vegetable crops in green house and open field conditions. Effect of salicylic acid on induced resistance in bean seedlings against two- spotted spider mite attacks and possible defense responses. Effect of neem extract against the different stages of Tetranychus urticae under laboratory conditions. 5.1-Mites Associated with four Vegetable Crops.Ten families of mites are as follows, Tetranychidae, Phytoseiidae, Tarsonemidae, Eriophyidae, Tydeidae, Stigmaeidae, Tenuipalpidae, Oribatidae, Cunaxidae, Laelapidae, were collected. The number of mites was the highest on tomato followed by eggplant and the lowest on chili pepper. In the eggplants, the most prevalent families were Eriophyidae followed by Tetranychidae. The least widespread family was Oribatidae. For tomatoes, the most common families were Tetranychidae followed by Eriophyidae and the least abundant families were Oribatidae. For common beans, the most prevalent families were the Tetranychidae followed by the family Phytoseiidae. No infestations by Eriophyid mites were recorded. For chili pepper, the most prevalent families were Phytoseiidae. No infestations were recorded from family Eriophyidae. 5.1.1-Population Fluctuation of the Mite Families on four vegetable crops. Mite population increased in numbers during the spring and summer and the beginning of the fall season and started decreasing to reach the lowest number during the winter months. The highest number of mites was recorded during June. The lowest number of mites was recorded during December. The highest average mites on eggplant were in July, as it began to gradually increase from the beginning of spring until it reached its peak in July, and the lowest rate of mites was in December. Chili pepper had the least vegetable crops under study infested with mites throughout the year compared to the rest of the crops. The highest prevalence of mite’s population in common bean was in the summer and autumn seasons, where the highest value was found during June. In tomatoes, the lowest prevalence of the mite population was in the winter season, where the lowest value was recorded in January and the numbers reached their peak during May. 5.1.2-Relationship between different plant levels and the density of mites .The upper leaves of plants for all the crops under study had the highest number in infestation followed by the lower leaves of plants and finally the middle leaves of plants at the level of crops different. The highest number of mites on the eggplant followed by tomatoes and the lowest among them was the pepper plant. As for the middle level, the highest number of mites was recorded on tomato plant followed by eggplant and the lowest presence of mites was on pepper. 82 While, for the lower level it achieved the highest number of mites on tomatoes. It was followed by eggplant and the least numbered at the lower level of the pepper.