论文部分内容阅读
水稻东格鲁病是东南亚和南亚国家的一种重要病害,此病一般在插秧后一个月开始发病.分蘖期病株主要表现部分叶片黄化,以外叶为害,自叶尖到叶片中下部,叶肉变淡呈鲜黄色.新生病叶有时未能完全展开且常有斑驳,而叶脉和叶片茎部以及叶鞘,在一个相当长的时期,仍保持绿色.发病后期,在一些较老的叶上常出现不规则的褐色斑点.病重田块常成窝发生.病窝处稻株显著发黄、矮化,严
It is one of the most important diseases in Southeast Asian and South Asian countries that the disease usually begins one month after transplanting.During the tillering stage, some of the diseased plants mainly show yellowing of leaves and damage from outside leaves, from the tip to the middle and lower leaves, The leaf discolored yellowish, and the neoplastic leaves sometimes did not fully expand and often mottled, while the veins and leaf stems and leaf sheaths remained green for an extended period of time. Later in the disease, on older leaves Often appear irregular brown spots. Disease often field blocks into the nest occurred in the Wo bed significantly yellow, dwarf, strict