First Report of the Microsporidian Infection of the Cabbageworm, Pieris rapae crucivora BOISDUVAL (Lepidoptera : Pieridae) in Japan

概要

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A microsporidian was isolated from the progeny of field-collected cabbageworm larva. Its spore size was from 3.1 to 5.3 μm in length and from 1.7 to 2.3 μm in width. When spores were stimulated to extrude their polar filament by hydrogen peroxide, their length ranged from 47 to 108 μm. Schizonts underwent binary fission and multiple fussion, and most of sporonts were monosporoblastic, though few were disporoblastic.Of lepidopterous insects used, eight species including silkworm, rice stem borer and cotton leafworm were susceptible, but the site of infection and pathogenicity varied from species to species. In the case of cabbageworm, infection occurred in the midgut most severely and their death time came earliest. In cotton leafworm, infection localized in nervous tissue particularly, and in silkworm and rice stem borer though the development of discase was slow, the disease well developed in muscle, silk glands and Malpighian tubes, and advancing to other tissues gradually.This microsporidian was identified as Nosema mesnili PAILLOT (1918) from its morphology, life cycle, host range and infected tissues.
日本応用動物昆虫学会の論文
1974-09-25