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近年来,由于水稻的不断改制,水稻螟虫的发生、危害也随着起了很大的变化.合肥及其以北稻区,基本上已改成稻麦、稻油轮作的一季中稻区,加上水稻品种更替、扩种杂交稻等原因,水稻栽培布局趋向复杂,稻螟随之从七十年代中期的最低密度又复上升.1984年出现20%以上的白穗率,说明会造成二成左右的稻谷损失.根据这种情况,我们本着经济、简便、安全、有效的原则,拟从“予防”出发,减避水稻螟害,探索中稻避螟的播、栽适期,从而降低发生面积,减少施药次数和用量,节约农业投资,保护水稻产量.特别是大量使用农药产生污染,栽培避螟就更显得迫切. 现将1983—1984年获得的结果整理报告于下:
In recent years, due to the constant restructuring of rice, the occurrence of rice stem borers has also undergone great changes, and Hefei and its north rice area have basically been replaced by rice and wheat, a quarter of rice and rice-oil crop, The replacement of rice varieties, the expansion of hybrid rice and other reasons, the layout of rice tends to be complicated, then the rice borer from the lowest density of the mid-seventies and then rose in. 1984 appeared more than 20% of white spike rate, According to this situation, we will proceed from the principle of economy, simplicity, safety and effectiveness to avoid rice stem borers and explore the sowing and planting period of rice borers, so as to Reduce the occurrence of area, reduce the frequency and dosage of application, save agricultural investment, protect rice production.Especially the use of pesticides to produce pollution, cultivation is even more urgent.Currently 1983-1984 finishing results reported in the next: