الفهرس 
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Abstract
This experiment was conducted at the experimental farm of Sakha Agriculture Research station, Kafr El-Sheikh Governorate during the two successive seasons 2015/16 and 2016 /17. 5.1. The sugar beet fly Pegomia mixta Vill.: 5.1.1. Effect of different host plants on female egg- laying: The highest peak of P. mixta eggs found in fodder beet followed by sugar beet and table beet in the last week of February and represented by 631, 384 and 342 eggs during the first season 2015/16, respectively. Effect of different host plants on larvae rearing: The highest peak of P.mixta larvae found in fodder beet in the first week of March followed by sugar beet in the first week of March and table beet in the fourth week of March and represented by 368, 327 and 198 larvae during the first season 2015/16, respectively. 5.1.3.Effect of different host plants on the percentage of parasitism by parasitoid Opius nitidulator: During the first season, the highest percentage of parasitism by O. nitidulator on sugar beet plants, table beet plants and chard plants recorded in the third week of March 2016 and represented by 35.7, 23.1 and 25.4%. Meanwhile, on fodder beet plants the highest percentage of parasitism recorded in the third week of December 2015 and represented by 36.4%.The Serpentine leaf miner Liriomyza trifolii:: The total larvae, Healthy larvae, parasitized larvae by D. isaea and unknown larval mortality of L. trifolii during the first season 2015/16: The highest peak of abundance of L. trifolii total larvae on faba bean recorded in the second week of March and represented by 419 larvae /100 leaflets. The highest peak for Healthy larvae found in the second week of March and represented by 201 larvae. While the highest peak of abundance for the parasitized L. trifolii larvae by D. isaea and unknown larval mortality recorded in the second week of March and represented by 124 and 94 larvae, respectively. 5.2.2.The total number of pupae of L. trifolii and the seasonal activity of the endoparasitoids during the first season 2015/16: The highest peak of abundance of the total number of pupae recorded in the second week of March 2016 and represented by 201 pupae. While, the highest peak of the endoparasitoid O. pallipes recorded in the second week of March 2016 and represented by 47 indiv. and the highest peak of the endoparasitoid H. circulus recorded in the first week of March 2016 and represented by 20 indiv. The Pea leaf miner Liriomyza huidobrensis: 5.3.1. The total larvae, Healthy larvae, parasitized larvae by D. isaea and unknown larval mortality of L. huidobrensis during the first season 2015/16: The highest peak of abundance of L. huidobrensis total larvae on Pisum sativum plants recorded in the third week of December and represented by 62 larvae /100 leaflets. The highest peak for Healthy larvae found in the third week of March and represented by 51 larvae. 5.3.2. The total number of pupae of L. huidobrensis and the seasonal activity of the endoparasitoids during the first season 2015/16: The highest peak of abundance of L. huidobrensis total number of pupa on Pisum sativum plants recorded in the third week of January 2016 and represented by 45 pupae. The highest peak for the endoparasitoid Opius sp. found in the first week of January 2015 and represented by 11 indiv.. While the highest peak of abundance for the the endoparasitoid chrysocharis sp. found in the fifth week of December 2015 and represented by 9 indiv.