الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Mosquitoes (Diptera, Culicidae) are the most prominent of the numerous species of blood sucking arthropods that annoy man and other warm-blooded animals. Their attacks on farm animals can cause loss of weight and decreased milk production. Some mosquitoes are capable of transmitting disease organisms that cause malaria, lymphatic filariasis, yellow fever, and dengue to man, encephalitis to man and horses, and heartworm to dogs. Over the last 45 years, the use of chemical pesticides such as dichlorodiphe-nyltrichloroethane (DDT), gammaxane, malathion, and chlordane has been the method of choice for mosquito control, and the antimalarial drugs chloroquine and the affordable pyrimethamine-sulfadoxine combination have proved successful in lowering morbidity and mortality. In addition, the emergence of pesticide and drug resistant mosquitoes, coupled with a clearer appreciation of the long-term detrimental effects of powerful chemicals to non pest insects and concern about accumulation of pesticides in the food chain and environment, has high lighted the need to quickly develop an alternative. Environmental methods and biological control are alternatives to chemical control and are key components of the integrated strategy. The use of vertebrate and invertebrate predators and entomopathogens as biological control agents and their role in an integrated control programs is reviewed with emphasis on fish, predatory copepods, entomopathogenic bacteria and fungal parasite of several genera of mosquitoes. A variety of aquatic insects in the orders Odonata, Hemiptera, Coleoptera, and Diptera are will known to prey upon mosquito larvae. These studies still are very limited; therefore, the present work is devoted to achieve the following objectives: 1- Survey of the aquatic predaceous insects upon mosquito larvae and pupae. 2- Observations on the natural existences, seasonal abundance and the role of these predators as natural enemies of mosquitoes in three different regions at Dakahlia Governorate (Mansoura, Talkha and Miniet El-Nasr). 3- The mosquito predator, Rhantus elevatus (Coleoptera, Dytiscidae) was recorded during the present study and it has not been subjected to any investigations, therefore, one of the aims of this study is to shed light on its life history and feeding habits. 4- Evaluation the effect of Bacillus thuringiensis israelensis (Teknar-G) on both Culex pipiens larvae and the larvae and adults of its predator, Rhantus elevatus.