调查、接种传毒试验和电镜观察结果表明,介体条沙叶蝉传播的小麦类菌原体兰矮病主要在小麦春季苗期初侵染,自生麦苗发病为主要初侵染源。 Investigation, vaccination test and electron microscopic observation showed that the wheat dwarf blue-dwarf disease of wheat leafhopper transmitted by the mesophyllous leaf was mainly infected in the early spring wheat seedling stage and the incidence of auto-born wheat seedling was the primary source of initial infection.