中晚粳稻区褐飞虱防治策略的研究

Control strategies of brown planthopper Nilaparvata lugens (Stal) in oh and be gen-rice areas

为了解二代褐飞虱对粳稻的为害损失，确定合理的防治指标和防治策略，为科学使用噻嗪酮、吡虫啉等药剂防治稻飞虱提供依据，作者在武育粳３号上，通过接不同的虫量，并进行笼罩的方法，研究了二代褐飞虱的增殖规律和为害损失及防治指标。并进行了锐劲特防治不同世代褐飞虱策略试验。结果表明，不同水稻生育期，不同虫口密度的褐飞虱的增长速度不一样；在水稻同一生育期，低密度的增殖速度要大于高密度，但总虫量高密度区显著高于低密度区。二代褐飞虱百丛虫量与水稻产量损失呈极显著正相关（ ｒ＝ ０．９５７６**），关系式为 ｙ＝－ １８．３３０２＋ １０． ２８９２ｌｇｘ（ｘ为 ８月上旬褐飞虱百丛虫量），防治指标为 １１０－１２０头。因此，在早发年，迁入量较大的年份必须采取“治二压三控四”的策略，１９９６－１９９７年全面推广这一策略，成效显著。

Relationships between adult amount of Nilaparvata lugens (Stal) on Wuyu gen-3 rice and the increasing rate of its 2nd generation as well as yield loss and chemical control were studied by Net-rearing and field experiments. The results showed, in the different growth stages of rice, adult increasing rate was bigger in low density area than in the high density area, hut the total amount of adults in high density area was much more higher than in low density area. A Positive correlation was observed between adults amount and yield loss, and the level for chemical control was 1 10 to 120 adults in l00 bundles of rice. In the field, spraying Regent(Fipronil)to control the second generation of the pest could increase the yield and get an excellent control result. So, in the years with early occurrence and large immigrating amount of the pest, the control strategies should be mainly to control the 2nd generation and manage the 3rd and 4th generations.