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玉米茎腐（青枯）病优势病原菌有Ｐｙｔｈｉｕｍｇｒａｍｉｎｉｃｏｌａ，Ｐ．ｉｎｆｌａｔｕｍ，Ｆｕｓａｒｉｕｍｇｒａｍｉｎ－ｅａｒｕｍ，Ｆ．ｍｏｎｉｌｉｆｏｒｍｅ。在对玉米的致病过程中，首先是由Ｐｙｔｈｉｕｍｓｐｐ．造成主根系的逐渐病腐而致供水不足形成地面上的青枯症状，随后Ｆｕｓａｒｉｕｍｓｐｐ．在病株内的演替过程中，逐渐取代Ｐｙｔｈｉｕｍｓｐｐ．而形成一定的优势，这是许多研究者在玉米病株的不同时期不同部位分离出不同病原菌的主要原因。本研究同时表明Ｐｙｔｈｉｕｍｓｐｐ．在高湿缺氧的土壤条件下，其致病作用优于Ｆｕｓａｒｉｕｍｓｐｐ．。
Maize stem rot (whitefly) disease pathogen Pyithiumgraminicola, P. inflatum, Fusariumgramin-earum, F. moniliforme. In the pathogenesis of corn, the first is Pythiumspp. Resulting in the gradual rot of the main root cause of inadequate water supply to form the symptoms of wilt on the ground, followed by Fusariumspp. Pythiumspp was gradually replaced in the diseased plants. And formed a certain advantage, which is the main reason that many researchers isolated different pathogens in different parts of corn diseased plants at different stages. This study also shows that Pythiumspp. Under the conditions of high humidity and oxygen deprivation, its pathogenicity is better than that of Fusariumspp. .