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微粒子病是当前为害严重的家蚕病害之一。1989年,四川省因此病淘汰不合格蚕种达50万张,我省阳城县也因此病损失蚕种近3000张, 微粒子病的病原是一种原虫,在蚕体内寄生时,孢子形态多为椭圆形,孢子大小基本一致,在显微镜下呈绿色折光,比重大,镜检时沉于标本液下层。微粒子病是一种典型的慢性病,感病较轻的蚕可发育到化蛹、化蛾和产卵。此病不仅在蚕期能够互相传染,还可通过蚕卵由上代传给下代。蚁蚕感病表现为不疏毛,体色深暗,体躯瘦小。2—3龄蚕感染可延到大蚕发病,大蚕期的症状有起缩蚕、斑点蚕、半脱皮蚕。熟蚕表现为不结茧、结不整形茧或薄皮茧,也有成为落地蚕或裸蛹。病蛹体表无光泽,腹部松弛,反应迟钝,体壁上有大小不等的黑斑。病蛾表现为羽化延迟,不
Particle disease is currently one of the most serious silkworm diseases. In 1989, Sichuan Province so out of 500,000 unqualified silkworm eggs, Yangcheng County, Zhejiang Province, so the loss of nearly 3,000 silkworm disease, the pathogen of microparticles is a protozoan parasites in silkworm, the spore morphology and more Oval, spore size basically the same, under the microscope green refraction, the proportion of large, microscopic examination was immersed in the lower part of the specimen. Micromonopathies are a classic form of chronic disease where susceptible silkworms develop to pupae, moths and spawn. The disease not only in the silkworm phase can be infected with each other, but also by silkworm eggs from the previous generation to the next generation. Ant silkworm susceptibility performance is not hair, body color dark, thin body. 2-3 years of age silkworm infection can be extended to the occurrence of large silkworm, silkworm silkworm, spotted silkworm, semi-peeling silkworm. The performance of cooked silkworm cocoon, cocoon knot is not shaped or thin skin cocoon, but also as a native silkworm or naked pupae. Diseased pupa body dull, loose belly, unresponsive, there are sizes on the body wall of black spots. Disease moths show emergence delay, no