الفهرس 
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Abstract
The work described in this thesis has been undertaken with the aim of searching for naturally occurring substances from some available Egyptian plants, to be used as natural pesticides, especially as acaricides against Tetranychus urticae Koch. Eleven Egyptian wild plants, that are available in Al-Arish, Sinai region, were collected and bioassay screened as acaricides and careful literature survey about them was done. Based on the data obtained from bioassay, three plant species were studied in details for their chemical components and also as acaricides against T. urticae. These plants are: Polygonum equisetiforme Sibth. (Polygonaceae). Lappula spinocarpos Forssk. (Boraginaceae). Ethulia conyzoides L. (Asteraceae). Repeated chromatographic separation and structure elucidation have resulted in partial separation and identification of seventy three natural products, which could be classified into four monoterpenoids (3,20, 22 and 23), six sesquiterpenoids (6, 51, 52 and 66- 68), four diterpenoid (7, 10, 25 and 40), eight triterpenes (8, 17, 30, 31, 50, 54, 72 and 73), eleven steroids (1, 2, 27-29, 41-44, 48 and 49), eleven shikimates (4, 18, 19, 32, 34, 36-38, 46, 59 and 62 ), six flavonoids (12-16 and 64), four coumarins (53 and 55-57), four lactones (5, 9, 21, 24), one vitamin (26), one lignan (69) and thirteen miscellaneous compounds (11, 33, 35, 39, 45, 47, 58, 60, 61, 63, 65, 70 and 71). E. conyzoides ethyl acetate fraction or its isolated compound ethuliacoumarin (55) and P. equisetiforme butanol fraction or its isolated compound quercetin (16) were the most effective among all tested extracts and isolated compounds as a natural acaricides against two spotted spider mite T. urticae Koch developmental stages.