植物卵菌病害是由鞭毛菌亚门卵菌纲病原真菌侵染所致。卵菌纲病原真菌种类多,寄主范围广,可致蔬菜、果树、花卉、林木、棉、麻、粮食、油料以及中草药等植物发生病害。可引起十字花科、茄科、葫芦科、天南星科、百合科、芸香科、葡萄科、豆科、禾本科、菊科、仙人掌科、苋科、藜科等数百种植物发生各种病害,如猝倒病、绵腐病、疫病、绵疫病、霜霉病、白锈病以及根腐、茎腐、果腐等等。这些病害几乎年年发生流行,造成很大损失。因此,卵菌纲病原真菌是植物十分重 Plant Oomycetes disease is caused by the infection of pathogenic fungi of the genus Entomoides. Oomycetes pathogenic fungi many, a wide range of host, can cause vegetables, fruit trees, flowers, trees, cotton, linen, grain, oil and herbs and other plant diseases. Hundreds of plant diseases such as cruciferae, Solanaceae, Cucurbitaceae, Araceae, Liliaceae, Rutaceae, Vines, Legumes, Grasses, Compositae, Cactaceae, Amaranthus, Chenopodiaceae and other diseases , Such as damping off disease, cotton rot, blight, cotton disease, downy mildew, white rust and root rot, stem rot, fruit rot and so on. These diseases are epidemic almost annually, causing great losses. Therefore, Oomycete pathogenic fungi are very heavy plants