微粒子病蛾発生の源

概要

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Experimentation on the oral infection of pebrine was performed by the larvae from the 1st day of the 3rd instar to the 3rd day of the 5th instar. It was revealed that the larvae, the 4th instar just after molting, can produce cocoons and eclose, if they are slightly infected with spores less than about 2,000 in number per larva, and that the larvae, the 3rd day of the 5th instar, even if they are infected with abundant spores, can make cocoons and eclose. Both of them apparently showed no symptom of disease. The number of spores contained in faeces discharged from diseased larvae, however, is generally very few, on an average 0.2 spores per field, when faeces are ground and observed. Therefore, the condition which brings about diseased silkworm moths may be explained as follows. Diseased silkworm mother moths with pebrine which lay hereditarily diseased eggs are derived from larvae slightly infected with spores per os during the larval stage from the 1st day of the 4th instar till ripening.
日本応用動物昆虫学会の論文
1966-03-25