“桂朝二号”(以下简称“桂朝”)是从1978年早造开始在高要县试种;1979年在全县普遍推广。1979年早造在各公社均表现良好,普遍增产丰收,晚造如植期及时,措施得宜的,也可获得高产。但是,该品种易感白叶枯病,两年来均有部分社队发病,尤以1979年晚造较为严重。计当造全县发生白叶枯病共56000亩中,“桂朝”占41140亩,其中上部叶片出现枯白的严重田有16476亩。可见白叶枯病在高要县已成为“桂朝”夺取高产的一个障碍。因此,两年来我们曾在高要县主要病区进行了调查研究,初步明确了“桂朝”白叶枯病 “Gui and Chao II” (hereinafter referred to as “Gui and Chao”) was started as early as 1978 in Gaoyao County; in 1979, it was widely promoted throughout the county. As early as 1979, all communes performed well, generally yielding bumper harvests, and late-cropping such as timely planting and timely implementation of appropriate measures could also yield high yields. However, this variety is susceptible to bacterial leaf blight. In recent two years, some communes and convoys have been reported, especially in the late 1979. Total counties made bacterial blight a total of 56000 acres, “Gui” accounted for 41,140 acres, of which the upper part of the leaves withered a serious field of 16476 acres. It can be seen that bacterial blight in Gaoyao County has become an obstacle to the high yield of “Gui and Chao”. Therefore, in the past two years, we conducted a survey in the main ward of Gaoyao County, initially clarifying the bacterial blight of “Gui and Chao”