الفهرس 
abstractOnly 14 pages are availabe for public view
 |  | from | 150 |  |  |
| | | from | 150 | | |
Abstract
Our aim was to investigate the possible effect of site and monthly ‘temperature’ variations on percentage and density of T. urticae and its predators on three economical plants. A one-year study, extending from February 2014 to January 2015, was conducted on Cucumis sativus, Solanum melongena (Abu-sawyer & Sarabium regions, Ismailia, Egypt) and on Moringa oleifera (East side of Suez Canal & El Koraim regions, Ismailia, Egypt). Results showed that there were no marked monthly variations regarding the percentage of mites and its predators, where the significant variations were recorded regarding their densities. The highest density of adult T. urticae on C. sativus and S. melongena was recorded in April while, it was recorded in December for M. oleifera. The highest density of T. urticae stages were recorded in Sarabium region for C. sativus and S. melongena while, it was recorded in El-Koraim region for M. oleifera. Regarding the predators, three predators were recorded on C. sativus and S. melongena namely; Phytoseiulus persimilis, Scolothrips longicornis and Stethorus gilvifrons. No predators were recorded on M. oleifera during the period of study. The density of predators was also affected by the factors considered. Hence, the ability of the plants to resist T. urticae may be attributed to certain characteristics of the soils. In conclusion, soil characteristics and monthly variations apparently were key factors affecting mite’s population and its predators and their effects were a host plant dependent.