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Abstract
This study aimed to providing information about the ecology and biology of the soil predacious mites in Egypt. This information{u2019}s are necessary to improve the successful control programs for many pests. Field studies were carried out on the soil actenidid mites in four governorates which are: Giza, El- Qalubia, El- Menofia and Beni-Suief for three years. Survey proved the occurrence of forty six actenidid mite species belonging to nine families (Anystidae, Bdellidae, Cheyletidae, Cunaxidae, Ereynetidae, Eupodidae, Raphignathidae, Trombididae and Tydeidae). The most abundant family was Cunaxidae followed by Cheyletidae whereas species of families Anystidae and Trombididae were less common. Seasonality of the actinedid soil mites was investigated monthly during two successive years determining their abundance related to abiotic and biotic factors. Actinidid mites were recorded through all months of the year. The abiotic factors as air temperature, relative humidity and rainfall were significantly effect on the mite abundance. Numbers of the actinidid mites were highest during spring and summer seasons with less abundant during autumn and winter seasons. Field crops considering as a biotic factors had a significant effect on the abundance of the mites (species and numbers). Maize and cotton crops were the most crops that the mites were associated while wheat and clover were the least. Development, reproductive potentiality and life cycle of the predatory mites, Cunaxa capreolus and Cheyletus eruditus feeding on different types of diets were studied at 25 and 30o C. The two mites had shorter developmental durations considering immature of both male and female feeding on the previous diets at 30o C than those feeding on the same type of diets but at 25o C. The difference in the female reproductive potentiality and also life cycle of males and females were obtained. The obtained life history patterns of the two predacious mites were temperature{u2013} dependent. These data serve as important base line information for the development of pest control strategy