用种子洗涤检验法和分部染色检验法研究了向日葵霜霉病菌（Ｐｌａｓｍｏｐａｒａｈａｌｓｔｅｄｉ）种子带菌特点。结果表明，内果皮和种皮中带有菌丝体、吸器和卵孢子，胚和胚乳中不带菌，种子表面污染有孢子囊和卵孢子。另外，种子间混杂的病株残片也带有菌丝体、卵孢子和孢子囊。带菌种子传病试验证实带有卵孢子的种子能产生少数系统侵染病株；而仅带有菌丝体和吸器的种子，除萌发率降低，幼苗发育不良外，未发现任何症状，体内也未见病菌 The seed-carrying characteristics of Plasmoparahalstedi seeds were studied by seed-washing test and fractional staining test. The results showed that the endocarp and seed coat with mycelium, inhalation and oospores, germ and endosperm without bacteria, the surface of the seeds contaminated with sporocysts and oospores. In addition, the seeds mixed between the diseased fragments with mycelium, oospores and sporangia. Infectious disease test showed that the seed with oospores could produce a few systemic infected strains. However, only the seeds with mycelium and aspirator showed no symptoms except the germination rate and seedling development, No bacteria