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根据病虫基数、作物布局、气候条件等因素综合分析,预测2003年河南省主要农作物病虫害偏重发生,部分地区部分病虫将重发生,全省各种病虫发生总面积3867万～4200万公顷次。 1.东亚飞蝗 夏蝗偏重发生,发生面积18.7万～20万公顷,秋蝗发生面积13.3万～16.7万公顷。 2.棉铃虫 总体中度发生,面积预计400万公顷次。其中棉铃虫一代轻发生;抗虫棉田二、三代偏轻发生,四代中
Based on the comprehensive analysis of pests and insect pests, crop layout, climatic conditions and other factors, it is predicted that the major pests and diseases in Henan Province will be seriously affected in 2003, and some pests will reoccur in some areas. The total area of various diseases and pests in the province will be 38.67 ~ 42 million hectares Times. 1. East Asian locust summer locust emphasis occurs, an area of 187,000 to 200,000 hectares, autumn locust occurred an area of 133,000 to 167,000 hectares. 2. The overall occurrence of cotton bollworm, the area is estimated 4 million hectares times. One generation of cotton bollworm occurred lightly; the second and third generations of insect-resistant cotton fields occurred mildly, and the fourth generation