مبارزه بيولوژيك با كرم ساقه خوار برنج و نقش آن در كاهش مصرف در كاهش مصرف در شمال ايران

Nowadays, pest management systems include the biological control method due to the increase of implementation problems of chemical control methods. On the basis of this research the efficient role of biological control factors, one of them Trichogramma bee against the Chilo suppressalis worm has been analyzed and studied in comparison with the use of irregular consumption of pesticides and its wastage in North Iran rice fields. The sites of the case study include Gilan, Mazandaran and Golestan provinces. Approximately more than 60% of chemical pesticides we used at site. Chilo suppressalis is one of the most important pests in the region. It was observed and collected for the first time in Chaboksar, Gilan, in 1972. Then it dispersed and spread from point to point in the region. 20 pesticides were used with different radicals in rice - fields, the most important of which is Diazinon. The activity of the natural enemy Trichogramma begans from the severity of Chilo suppressalis infestation in Mazandaran from 1975 to 1977. The implemented research shows that the above mentioned method (non - chemical method) was used extensively in the Second Five - year plan of North of Iran. The results show high levels of release at rice - field of Mazandaran province. At the same time about 80% of farmers use the chemical methods for pest control, and only 37% of farmers knew and informed about the biological control method. The pesticides reduction and application of biological control method have been successful and reduced by 60% the pesticides consumption in North of Iran. The Third Five - year Plan must be supported by experts and researchers and by financial means. Also the farmers need to have access to the research.