论文部分内容阅读
一、当前病虫发生情况北京市植物保护站日前称,当前全市大白菜生产陆续进入包心期,也是病虫害防治的关键时期,据全市蔬菜病虫监测点调查,目前全市大白菜总体生长状况良好,发生的病虫害种类以霜霉病、鳞翅目害虫等为主,其中菜螟在个别地块上升为优势种。主要病虫发生情况如下:病害总体轻发生,以霜霉病发生最普遍,发病叶片多位于中下部,病田率为86.7%(去年同期96.8%),平均病株率33.9%(去年同期47.7%),最高
First, the current occurrence of pests Beijing Plant Protection Station recently said that the current city’s cabbage into the pericardal phase one after another, but also the key period for the prevention and control of pests and diseases, according to the city’s vegetable pests monitoring point survey, the city’s overall good growth of cabbage , The occurrence of pests and diseases to downy mildew, lepidopteran pests and other main, of which borer in individual plots rose to the dominant species. The main diseases and pests occurred as follows: The overall incidence of disease was light, with the most common occurrence of downy mildew, the incidence of leaves are located in the lower part of the disease rate was 86.7% (96.8% over the same period last year), the average diseased plant rate of 33.9% (47.7 %),highest