论文部分内容阅读
蚕豆是本省主要夏粮和绿肥作物之一,蚕豆赤斑病是其重要病害之一。据本站研究结果表明:蚕豆赤斑病发病严重度:一级减产4.4—9.2%,二级减产14.9—32.0%,三级减产39.5—64.5%,四级减产58.4—83.1%,受害严重的田块甚至失收。故掌握其发病规律,及时准确地预报其发病趋势,适期采取行之有效的防治措施,是夺取蚕豆丰产丰收的重要环节。一、发病规律据本站多年观察:蚕豆赤斑病冬前发病,但因冬季低温而被抑制。到来年2、3月份随气温逐渐回升,又开始扩展、蔓延。首先表现为水平方向(病枝率)的扩展,3月下旬病枝率开始激增,4月上旬达100%发病;其次为垂直方向(病叶率、病叶指数)的上升,3月底
Broad bean is one of the major summer crops and green manure crops in the province. Broad bean red spot is one of its important diseases. According to the results of this study, the incidence of broad bean red spot disease is as follows: the first grade is reduced by 4.4-9.2%, the second grade is reduced by 14.9-32.0%, the third grade is reduced by 39.5-64.5%, the fourth grade is reduced by 58.4-83.1% Field even lost. Therefore, it is an important link to seize the harvest of high yield and high yield of broad bean because of its regularity of occurrence, timely and accurate forecast of the trend of its occurrence and proper measures of prevention and control. First, the incidence of disease According to this station for many years to observe: Broad bean red spot disease onset in winter, but was suppressed due to winter low temperature. The coming year 2 and 3 months with the temperature gradually picked up again began to expand and spread. First of all, it showed an extension in the horizontal direction (disease branch rate). In late March, the incidence of branch disease began to surge, reaching 100% in early April; followed by an increase in the vertical direction (sick leaf rate and diseased leaf index); at the end of March