Studies on Infectivity of Cordyceps, Paecillomyces japonica, on the Domestic Silkworm, Bombyx mori.

눈꽃 동충하초균의 누에감염에 관한 연구

This study was carried out to investigate infection process, symptoms and $LD_{50}$ values of the entomopathogenic fungus cordyceps, Paecillomyces japonica, on the domestic silkworm, Bombyx mori. Susceptibility of infection in the silkworms by cordyceps, Paecillomyces japonica, was 100% in $10^{7}$ block, 96% in $10^{6}$ block, 76% in $10^{5}$ block, 44% in $10^{4}$ block, 28% in $10^{3}$ block and 8% in $10^{2}$ block. Cordyceps, Paecillomyces japonica, was highly infectious to the silkworms. A pathogenicities of cordyceps, Paecillomyces japonica, may be highly virulent because of the low resistance or high susceptibility of the silkworms. Dosage of the pathogen of $LD_{50}$ was $3.78{\times}10^{3}\;spores/mm^{3}$.

건강식품으로 각광 받고 있는 누에 동충하초균의 누에에 대한 병원성을 알아보기 위하여 동충하초균을 4령기잠에 접종 후 감염잠 발생율을 조사한 결과 $10^{7}/mm^{3}$ 시험구에서는 100%, $10^{6}/mm^{3}$ 시험구에서는 96%, $10^{5}/mm^{3}$ 시험구에서는 76%, $10^{4}/mm^{3}$ 시험구에서는 44%, $10^{3}/mm^{3}$ 시험구에서는 28% $10^{2}/mm^{3}$ 시험구에서는 8%의 감염율을 나타내었다. Probit법에 의한 생물검정 결과 감염효과는 $LD_{50}$ 값이 $3.78{\times}10^{3}\;spores/mm^{3}$ 로서 생물 살충제로 개발 가능성이 높았다.