الفهرس 
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Abstract
This study aimed to : 1. The objective of the experiment : an Empirical studies on major insect pests of trees, grapes and associated predators as well as the study examine the impact of some weather factors on the population density of the most important of these insect pests and predators associated. 2. The method and results : the methods of measurement and note taking and data recording and statistical analysis of various scientific ways. 3 Results : A. 1-The obtained results showed that 12 insects species belong to the four order : Homoptera ,Hiemapter, Lepdoptera and Thysanoptera. B.-Eight species belong order Homoptera namely I.sechellarum P.vitis, P.longispinus , M.hirsutus., E.decipiens, E.lybica, L.ulmi, and C.ficus and one species belong order Hemiptera namely N.viridula .C. 3-Two species belong Lepedotra order nemaly L.botrana and C.gnidiella at last one species namely R.syriacus belong to the order thysanoptera. Eight predatory insects belong to two order were recorded.D order Coleoptera was the most dominant order in the two seasons of study as it formed 85.50% of the total insect numbers in 2014 and 81.74% in 2015.E.The obtained results indicated that seven predator’s species belong to this order these species namely; R. cardinalis; N. includens , C.vicina isis,C.vicina nolitic, H.tredecimpunctata, C.undecimpunctata and P.alferii were recorded.F.one species belong order of neuroptera namely C.carnea .Conclusion:The aim of the study the ratio of predators to their prey is to define the times in which the ratio differ in favor of harmful insects (prey) to be launched predators of insect to narrow this ratio so that no more than (a predator 1: 10 prey) or the use of safe pesticides at this time.