Ricefield ecosystem management and its impact on disease vectors

Abstract
Wetland rice culture and irrigation schemes in tropical and subtropical regions create ecological conditions favourable to the propagation of diseases whose vectors require an aquatic environment. The most important are malaria, schistosomiasis and Japanese encephalitis. This paper reviews (1) the major features of the ricefield as an ecosystem for vectors of selected diseases, (2) the effects of the factors of crop intensification on vectors, and (3) the possible methods of vector control through management of the ecosystem which includes water management, especially the alternate wetting and drying method, conservation of natural enemies, utilization of pesticides of plant origin, and biological control by predators and pathogens.

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