الفهرس 
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Abstract
For studying the abundance and population fluctuations of main insect species infesting vegetable crops and their predators at Mansoura, district. Samples were taken daily during two years from 26th December 2015 till 24th December 2017, by using two Robison light traps (Robinson and Robinson 1950). The traps were placed in the farm of Faculty of Agriculture, Mansoura university at a height of 7 Meters. The two light traps were baited with Mercury vapour lamps (250 walt) as a source of light.Therefore, this study aimed to evaluate the following points:Survey the main insect species attacking the vegetable crops and their predators at Mansoura district.Study the population fluctuations and flight activity of the main insect species infesting vegetable crops.Evaluate the effect of some weather factors on the population fluctuations of the important insect species attacking vegetable crops and their associated predators at Mansoura district.1.1. Surveying insect species infesting vegetable crops by using light trap at Mansoura district : It can be seen that, there were seven species belonging to Family: Noctuidae (Order: Lepidoptera), one species of the Family: Gelechiidae and one species of Family: Pyralidae. One species from Family: Gryllotalpidae (order Orthoptera) were recorded. One species from Family: Pentatomidae (Order: Heteroptera) and one species from Family: Scarabaeidae (Order: Coleoptera) were found. The noctuid insects were: Spodoptera littoralis (Boisd.) , Spodoptera exigua (Hubner) , Agrotis ipsilon (Hufn.), Autographa gamma L, Autographa chalcytes L, Autographa ni L., Heliothes armigera (Hbn), Phthorimaea operculella (Zeller) this species belonging to family Gelechiidae and Cryptoblabes gnidiella (Mill.) this species belonging to Family: Pyralidae The Gryllotalpidae, Pentatomidae and Scarabaeidae insects were Gryllus domesticus L., Nezara viridula (Linnan) and Pentodon algerinum dispar( Baudi). It can be stated from this table that the most dominant species was A. ipsilon which represented 22.80% of the total catch in 2016 and S. littoralis and H. armigera which represented 20.26% of the total catch in 2017.1.2. Surveying some predators associated with these insect by using light trap at Mansoura district: The results obtain showed that there were two species belonging to two Families: chrysopidae Order: Neuroptera and Family: Anthocoridae order: Heteroptera: . These species were chrysoperla carnea It can be stated from this table that the most dominant species was Orius albidipennis. Population fluctuations and effect of temperature and relative humidity on some insect pests caught by using light traps at Mansoura district: