28 Jan 5 Major diseases and predators of Silkworm and their control.
रेशमकीट के 5 प्रमुख रोग व परभक्षी तथा उनका नियंंत्रण। Silkworm is reared for the production of cocoons, which is the raw material for silk production. It provides gainful employment and helps in the improvement of the socio-economics life of the peoples in the rural areas. During rearing, the silkworm are affected by various types of pathogenic agents viz. protozoa, virus, fungi and bacteria. It has been reported that about 30-400 % of total crop loss is due to the occurrence of four major diseases namely Pebrine (protozoan disease), Flecherie (bacterial disease), Grasserie (viral disease) and Muscardine (fungal disease). Other than diseases Uzi fly is considered as serious endo-larval parasitoid of the silkworm and yield of cocoons is reduced tremendously due to the infestation of Uzi fly. Diseases of Silkworm and their Management 1. Pebrine: Pebrine is the most important disease of silkworm that is caused by by the protozoa called Nosema bombycis. Pebrine is commonly observed during rainy and winter season and transmitted to offspring by transovarial. Symptoms: Initial stage of infection: The infected silkworm larvae appear to be healthy. Only microscopic examination of the silkworm larvae may indicate the presence of shinning spore of Nosema. Advanced stage of infection: The silkworm larvae loose appetite, unequal in size, retard in growth, moult irregularly. The dead larvae turn black in colour...