الفهرس 
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Abstract
1. Introduction
Vegetables are very important commodity, most vegetables have a high economic value, and as a source of nutritive food especially vitamins and minerals. Cucumber (Cucumber sativus L. Fam. Cucurbitaceae) is one of the wide spreading vegetable crops that grow under greenhouse conditions around the world. It is a semitropical plant that grows well under stable warm and humid conditions, with high levels of light. Mediterranean countries prefer cucumber because it can be planted two or three times per year. (Tuzel and Leonardi, 2009, & El-Khayat et al. 2010).
Cucumber is an important vegetable cultivated under different environmental conditions, open fields, and greenhouses for local consumption and exportation. Polynet houses/net houses provide suitable microclimatic conditions for the growth and development of piercing sucking pests. Warm humid conditions are preferred by the sap-sucking insects. The highest population levels force the farmers to use excessive usage of chemicals Ghongade and Sangha. 2021. Many new varieties of cucumber are being introduced by seed companies each year, therefore, variety evaluation is essential in order to recommend these varieties to the industry in Egypt. In particular, varieties that have local adaptability and market acceptance, together with higher yields improved fresh quality and better pest tolerance are needed, (Ghallab et al., 2011).
Piercing sucking pests such as; spider mite, aphids, whitefly, leafhoppers and thrips are widely spread attacking a wide v