论文部分内容阅读
玉米青枯病又称玉米茎基腐病或茎腐病,是世界性的玉米病害,但在我国近年来才有严重发生,甚至绝产。1.发病症状玉米青枯病主要发生于玉米乳熟期。发病初期,植株的叶片突起,出现青灰色干枯,似霜害;根系和茎基部呈现出水渍状腐烂。进一步发展为叶片逐渐变黄,根和茎基部逐渐变褐色,髓部维管束变色,茎基部中空并软化,致使整株倒伏。发病轻的也使果穗下垂,粒重下降。首先是根系发病,局部产生淡褐色水渍状病斑,逐渐扩展到整个根系,呈褐色腐
Corn bacterial wilt, also known as corn stem rot or stalk rot, is a worldwide corn disease, but in our country in recent years have serious occurrence, or even absolute. 1. Morphological characteristics Corn bacterial wilt occurs mainly in the milky stage of corn. Early onset, plant leaves protruding, grayish greenish dry, like frost damage; root and stem base showed a water-like rot. Further development of the leaf gradually turn yellow, roots and stem base gradually brown, vascular discoloration of the pulp, stem base hollow and softened, resulting in the entire plant lodging. Less incidence of ear drooping, grain weight decreased. The first is the root of the disease, the local produce light brown water stain-like lesions, gradually extended to the entire root system, brown rot