论文部分内容阅读
20 0 1年我市棉花种植面积 4 33万ｈｍ2 ,较2 0 0 0年增 0 13万ｈｍ2 ,棉铃虫发生为大发生 ,而且发生程度逐代加重 ,是继近几年偏重发生之后的又一大发生年。全市棉铃虫各代累计发生面积9 97万ｈｍ2 。全市累计综合防治面积 2 3 2 5万ｈｍ2次。1 棉铃虫发生特点(1)发生期提
In 2001, the cotton planting area of our city was 433,000 hm2, an increase of 0 130,000 hm2 compared with that in 2000. The occurrence of cotton bollworm took place as a major occurrence and the degree of occurrence increased proportionately. A big year. The city’s cotton bollworm generation area of 9970000 hm2. The city has a total comprehensive prevention and control area of 232 5200 hm2 times. 1 cotton bollworm characteristics (1) the occurrence of mention