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华北地区所发生的小麦丛矮病证明是由北方禾谷花叶病毒(NCMV)所致,并由灰飞虱所传染,文中记述了在我国发生的历史及分布的情况。发病小麦在田间的症状可以分为四个类型:1、植株正常,叶上有退绿或黄色线条,2、植棒正常或稍矮,叶脉间有严重退绿或变黄,根部发育稍差,3、植株中等矮化,有宽的退绿条纹,叶脉亦变色,分蘖增多,4、植株严重矮化,分蘖异常增多,根系发育恶劣。轻症植株常发展成为重症株。重症植株不能越冬。有些轻症植株后期有隐症现象。根据病情轻重,在田间调查中划分0、Ⅰ、Ⅱ、Ⅲ四级,逐级称取千粒重,结果Ⅰ级病株的千粒重损失为52.6%,Ⅱ级为66.7%,Ⅲ级为93.23%。
The evidence of the occurrence of wheat bushy dwarf disease in North China was caused by northern cereal mosaic virus (NCMV) and was transmitted by Laodelphax striatellus. The history and distribution of the disease occurred in our country were described. Symptoms of disease wheat in the field can be divided into four types: 1, the plant is normal, the leaves have green or yellow lines, 2, plant rods normal or slightly shorter, between the veins have a serious back to green or yellow, the root development is slightly worse 3, medium dwarf plants, there are wide back green stripes, veins also change color, increased tillers, 4, plants dwarf, abnormal tillering, poor root development. Mild plants often develop into severe disease. Severe plants can not wintering. Some mild symptoms of late symptoms of plants. According to the seriousness of the disease, 0, I, II and III were divided into four grades in the field survey, and the 1000-grain weight was weighed step by step. As a result, the loss of 1000-grain weight of grade I strain was 52.6%, grade II was 66.7% and grade III 93.23%.