稻纵卷叶螟危害损失与防治指标研究

稻纵卷叶螟对水稻危害损失及防治指标的研究结果表明 ,水稻功能叶受害后 ,造成的产量损失 ,粳稻品种大于杂交籼稻 ;千粒重损失及空秕率和产量损失率呈显著正相关。不同叶位受害对经济产量的影响 ,总趋势是由上而下依次递减 ,水稻植株各器官存在着一定的经济补偿力。淮北稻区稻纵卷叶螟的防治指标 ,初步定为粳稻百丛 30～ 40头 ,杂交籼稻百丛 40～ 5 0头。经大面积示范、推广证实 ,这一防治指标能有效地控制稻纵卷叶螟的危害 ,农药费用可节省 30～ 75元 /hm2 ,挽回稻谷损失一成左右。药剂防治次数减少 2～ 3次 ,节省用工费 15～ 45元 /hm2 ,并降低了稻谷内的农药残留量 ,减少了环境污染 ,净化了农田生态系统 ,经济效益明显

Study on the Damage and Control Index of Rice Leaf Folder

The damage and control index of rice leaf folder was studied. The result indicated that the lost from Japonica rice variety was much heavier than indica rice variety when the function leaves were damaged by rice leaf folder. There was a significant positive correlation between 1000-grain weight, empty seed and yield. The effect of damaged leaf on economic yield was gradually reduced from high leaf position to low leaf position and there was a compensative relation among plant organs. In Huaibei rice region, the control index of rice leaf folder was 30-40 masses per hundred-plant in Japonica rice and 40-50 masses per hundred plant indica hybrid rice, and 30-70 yuan/hm2 for chemic use may be saved according to the index in large area production.