论文部分内容阅读
今年早稻飞虱在江西省属特大发生年,其特点是:迁入早、峰次多、繁殖快、密度高、分布广、为害重,为近三十年来所罕见。据全省十一个地、市统计,早稻病虫发生面积共计3125万亩次,其中稻飞虱发生面积1113万亩,占早稻面积的48%,占早稻病虫发生亩次的35.6%。早稻受害后,穗期出现“四多”,即死秆禾多,倒伏禾多,花斑禾多,百丛虫量多。每百丛虫量最多的6.52万头,即每丛平均652头。典型田块每百丛竟达11.3万头,即每丛平
This year, the rice planthopper occurred in the extra-large year in Jiangxi Province. Its characteristics are as follows: moving in early and peak times, multiplying rapidly, having high density, wide distribution and serious damage, which is rare for nearly three decades. According to the statistics of eleven prefectures and cities in the province, the area of pest and disease occurrence in the early rice reached a total of 31.25 million mu, of which 11.13 million mu occurred, accounting for 48% of the area of early rice and 35.6% of the mu of pests and diseases occurring in early rice. After the damage of early rice, there are “four more” in the spike stage, that is, more dead straw, more grass, more grasshopper and more than 100 insects. There are 65,200 heads per hundred of bugs, averaging 652 heads per bundle. The typical plots of up to 113,000 per hundred, that is, each bundle level