对天蚕(Anthcraca yamamai)微孢子虫病的发生、病征、传染途径、病原等进行了研究,结果表明:天蚕微孢子虫病病蚕衷现出明显发育缓慢、蚕的体表出现褐色渣点,在气门线附近较密集和明显;天蚕微孢于呈长椭圆形,孢子长3～4.5μm,宽1.5～2.25μm,孢子无色;折光性强,孢子比重大于水;天蚕微孢子虫病的传染途径有胚种传染和食下传染;天蚕微孢子虫病与柞蚕微粒子病能够通过食下互相传染. The results showed that the silkworm resistance of Nilaparvata bicuspis was obviously slowed down and brown body residue appeared on the body surface of silkworm, Which is dense and obvious near the valve line. The microsporum of A. niloticus has a long oval shape, the spores are 3 ~ 4.5μm wide and 1.5 ~ 2.25μm wide, the spores are colorless; the light refraction is strong, the spore’s specific gravity is bigger than that of water; Infections have germ-type infection and food-borne infection; Amebiasis and tussah micro-particle disease can be transmitted by eating each other.