一、黄化型萎缩病的症状、病原及流行原因桑萎缩病是桑树全株性病害,按病症可分为三种病型,即黄化型、萎缩型、花叶型,特别是黄化型萎缩病为害更为严重,治疗更为困难。感染黄化型萎缩病的病树条短叶小质差,不能用来养蚕,几年后桑树即死亡,往往因此成片挖除。 First, the symptoms of edema, etiology and epidemic reasons Mulberry atrophy is a mulberry whole plant disease, according to the disease can be divided into three types of disease, namely yellow type, atrophy type, mosaic type, especially yellow Type atrophy is more serious damage, treatment more difficult. Diseases infected with yellow type of atrophy disease short stature short stubble poor quality, can not be used to sericulture, mulberry died a few years later, often so into pieces of digging.