الفهرس 
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Abstract
Semiochemicals (e.g. herbivore induced plant volatiles and host kairomones) play very crucial role in the communication of the tritrophic levels (plant-insect-natural enemy).The main objectives and results of the present studyare as follow: 1) Study the effect of solanaceous species on the biological attributes and attraction response of tomato leaf miner (TLM) under laboratory conditions. Results indicated that TLM females prefer tomato plants for their offspring more than other tested solanaceous species with attractiveness ratio of 83.3% compared to 76.6, 70 and 13.3% for potato, eggplant and pepper plants, respectively.The tested species had a profound and significant effect on the development of all immature stages of TLM. Data indicated also that TLM cannot survive on pepper in all developmental stages.The percentages of immature survival were 83.33, 86.67 and 86.67% on tomato, potato and eggplant, respectively.Longevities of TLM females reared on tomato, potato and eggplant lasted13.75, 12.83 and 15.38days, respectively.As for the oviposition period, the longest period was recorded on eggplant, whereas the shortest was on tomato and potato.Lifetime fecundity was the highest in TLM females reared on tomato plants at 262 eggs/female compared with 198 eggs on eggplant,2) Compare the attraction of tomato plants at different plant agesand infestation levels to TLM adults.Results showed that the higher percentages of attractiveness were associated with the elder (45 days) tomato plants with an average of 76.67%,3) Evaluate the ability of TLM infested tomato plants to attract the predatorsNesidiocoris tenuis, chrysoperla carnea and Orius albidipennis at different levels of infestation and the effect of TLM relics on the attraction response of the predator’s immatures.The attraction response of N. tenuis adults to the intact plants was in the lowest rate with an average of 53.33%, and the highest rate was recorded to the host-plant-complex treatment with an average of 83.33%. When studying the effect of extracts from TLM larvae, eggs, feces and scales as kairomonal sources for the tested natural enemies, O. albidipennis was highly arrested to larval extract, C. carnea to scales extract, N. tenuis to larval extract and Trichogramma evanescens to eggs extract,4) Compare the ability of the egg parasitoid T. evanescens to locate its host and estimate the parasitization performance of this parasitoid on T. absoluta at different levels of TLM infestation and distance intervals from the parasitoid releasing point.Data indicated that the highest parasitism in TLM eggs by T. evanescens was recorded in the host-plant-complex treatment with percentageof parasitism of 13.63%; followed by 6.25% and 3.72% in intact and washed plants treatments, respectively.There was a direct correlation between the percentage of parasitism and the distance from the releasing point. Pertaining to the position of TLM eggs, data showed that the percentages of parasitism by T. evanescens adults in all tested treatments were always higher in the lower part of the plant compared to the upper part.