论文部分内容阅读
在云南低纬高原的复杂条件下,白背飞虱和褐稻虱的越冬虫源,其平面分布北界为北纬25°07′,垂直分布高限为海拔1480m。越冬临界温度白背飞虱为8.82℃,褐稻虱为9.27℃。冬春相对湿度在60％以上,干燥度在10以下,具有冬秧、冬早稻、春秧及再生稻和落粒自生苗存活的地区都能越冬。夏秋随西南(东南)气流方向迁飞,主害代从南向北梯向传递特点是:北纬23°以南为5、6月主害带区;北纬23～24°为6、7月主害带区;北纬24～25°为7、8月主害带区;北纬25°以北为8月主害带区。防治对策:一是分区治理,压低虫源;二是掌握对象田,狠治主害代。
Under the complex conditions of Yunnan low latitude plateau, the overwintering source of whitebacked planthopper and brown planthopper were north latitude 25o 07 ’north latitude and elevation 1480m above sea level. The critical temperature for winter wintering is BPH, 8.82 ℃ and BPH is 9.27 ℃. Relative winter and spring relative humidity above 60%, dryness below 10, with winter seedlings, winter early rice, spring seedlings and ratooning rice and perennial self-survival areas can survive the winter. Summer and autumn with the southwest (southeast) flow direction of migration, the main agent on behalf of the transfer from south to north is characterized by: north latitude 23 ° south 5, 6 months the main zone; latitude 23-24 ° 6, July main Harmless zone; latitude 24 ~ 25 ° for July and August the main zone; north latitude 25 ° north of August for the main zone. Prevention and control measures: First, zoning control, depression insect source; the second is to master the object field, ruthless governance of the main generation.