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Abstract
V- SUMMERY
The present studies were initiated in September 2001 and terminated in November 2004. The objective of the present studies was carried out to evaluate the effects of some fertilizers on the population densities of mites inhabiting soil beneath potato plants during six seasons. In addition, the population density of collembolan and the effects of three foliar nutrients on the populations of foliar mites and white fly associated with potato plants in the field on the 5th and the 6th seasons only were studied.
On the other hand, the extraction and investigation of mites and collembolans were counted and identified at the laboratories of Plant Protection and Economic Entomology & Agricultural Zoology Departments, Faculties of Agriculture Saba Basha and Shebin El-Kom Universities of Alexandria and Menoufia, respectively.
In Egypt, potatoes are by far among the most important crop plants. On the other hand, potatoes are liable to infestation by some pests in both fields and stores. Therefore in Egypt, strong efforts have been conducted for increasing the production of potato yields to meet with the increasing demand for both local consumption and export.
ECOLOGICAL STUDIES:
The field experiments were designed to evaluate the effects of cultivation seasons, three fertilization types and the influences of certain environmental factors on the distribution and abundance of the four mite suborders inhabiting soil under potatoes in Abo-Hommous, El-Beheira Governorate. Also, the population density of collembolans and the effects of three foliar nutrients on the populations of foliar mites and white flies