テンサン飼育圃場における核多角体病防除に関する総合的検討

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タイトル別名
  • Synthetic study on nucleopolyhedrosis control of the field in Antheraea yamamai.
  • テンサン シイク ホジョウ ニ オケル カクタカクタイビョウ ボウジョ ニ カ

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抄録

It has been found that repeated outdoor rearing of wild silkworms at a single farm causes contamination of the farm with nuclear polyhedrosis viruses (NPV), which results in unstable production. Therefore, a synthetic evaluation was performed on the cause of the disease and methods for providing stable production, such as the possibility of transmitting the viruses by insects inhabiting the farm and a method to inactivate the pathogen in soil and rearing trees. The results obtained are as follows. 1) Ants and aphides, high-density inhabitants of the farm, aggravated the transmission of the disease's viruses. 2) These viruses were found remaining on the branches and leaves of the red oak trees after rearing was completed. 3) Most of remaining viruses in soil were found to be accumulated in the surface layer to a depth of about 2cm. 4) The remaining viruses in soil could be inactivated using a flamethrowing sterilization device (tip temperature, 1, 800°C). 5) The decrease in the silkworm production during the young stages was mostly due to destruction by ants.

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