论文部分内容阅读
当前,长江流域、江准、江南稻区单季稻大部分处于孕穗、抽穗阶段;江南双季晚稻大部处于分蘖期,部分已开始进入拔节生长阶段。7月份以来,受台风和降水偏多等气候条件的影响,大部分稻区稻飞虱发生明显重于2005年同期,江南北部和长江流域尤为严重。据各地调查,目前褐飞虱已上升为主要种群,灯下仍不断出现迁入峰,数量偏大,田间虫口密度增长
At present, most of the single cropping rice in the Yangtze River valley, Jiang quan and Jiangnan rice areas are at the booting and heading stage. Most southern rice double cropping late rice are at the tillering stage and some of them have already entered the stage of jointing growth. Since July, affected by the climatic conditions such as typhoon and heavy rainfall, the occurrence of planthoppers in most rice areas was significantly heavier than that in the same period of 2005, especially in the northern areas of Jiangnan and the Yangtze River. According to local surveys, at present, the brown planthopper has risen to the main population, and the number of migrating peaks still continues to appear under the lamp. The population is relatively large and the population density of insects in the field increases