一．气候变暧对主要农作物病虫在发生流行的影响 （一）暧冬对病虫害发生流行的影响 １．暖冬造成主要农作物病虫越冬基数增加、越冬死亡率降低、次年病虫害发生加重。受暖冬的影响，１９９１年广西南部１６县冬后褐飞虱残虫平均 ０．８头／ｍ２，最高 １４．４头／ｍ２，比 １ one. Impact of Climate Warming on Occurrence and Epidemic of Pests and Diseases of Major Crops (I) Effect of Warm Winter on Epidemic of Pests and Diseases 1. In winter, the number of overwintering base of major crops increased, the overwintering mortality rate decreased, and the following year increased. Affected by the warm winter, in 1991, 16 counties of southern Guangxi in the post-winter period had an average of 0.8 head / square meters of brown planthopper and a maximum of 14.4 heads / m2,