養蚕農家における濃核病発生の疫学的研究

概要

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Epizootiological investigations were made on the occurrence of densonucleosis at sericultural farms in Saitama and Nagano Prefectures, indicating an enzootic of densonucleosis in the both sericultural areas; occurrence of the disease was only noted at a few farms in Nagano Prefecture. The enzootic was mainly due to the rearing of the silkworm strains of nonsusceptible or highly resistant to the infection of densonucleosis virus. However, densonucleosis virus was generally detected in the dust from every farm in Nagano Prefecture, even from farms where nonsusceptible silkworm strains were reared and no occurrence of densonucleosis had been seen. It was found that the virus detected in the dust was derived from contaminated mulberry leaves with a densonucleosis virus which multiplied chronically in the mulberry pyralid, Glyphodes pyloalis, infesting the mulberry plantation. Under these circumstances, rearing of the nonsusceptible silkworm strain seemed to be one of the best ways to protect the densonucleosis in the farm. In Saitama Prefecture, on the other hand, the densonucleosis virus was not detected in the dust from any farm, nor densonucleosis infection in the mulberry pyralid was recognized.
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