水稻黄矮病的发生及流行

 我国水稻黄矮病,是六十年代以来新发现的一种病毒病,目前分布范围广,一般发病损失产量2-3成,是南方稻区的一个重要病害。
本病的症状特征是:始病叶位,在水稻生长前期,从顶叶以下一、二叶开始;病斑先从叶尖端开始向叶基扩展,全叶形成叶肉黄化、叶脉绿色的条状或斑驳状花叶,以后向上纵卷枯黄;病叶与茎杆夹角增大。

STUDIES ON THE DEVOLOPMENT AND EPIPHYTOTRIS OF THE RICE YELLOW STUNT DISEASE

The rice yellow stunt in sonth & east China, was widly distributed and caused a loss amounts to 20-30% of the crop.The main symptoms of the dise-ase consists of yellowing in the second or third youngest leaf of the plant mottling stripe of the interveinal area of leaves later. Diseased leaves form wider angles with the stem. The pathogen is a bullet-shaped virus, with parti-cle size ranging 100-180×50-90 nm, shown in ultra-thin sections. Three species of the rice green leafhoppers (Nephotettix cincticeps N. nigropictus and N.vire-scens) have been shown to be vectors of the disease.