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分析2005~2013年单一病虫害对水稻产量的影响,结果表明,对水稻主要病虫不防治,晚稻的稻谷损失率明显高于早稻。早稻主要病虫不进行化学防治时稻谷损失量较大,但成灾少,单一病虫中二化螟、纹枯病造成危害较重,稻飞虱、稻纵卷叶螟仅在少数年份造成损失。晚稻主要病虫不进行化学防治成灾频率大,甚至造成绝收,单一病虫以稻飞虱造成的危害突出,对产量影响显著。效益分析结果表明,化学防治病虫害,早稻一般需1~2次,少数年份可不防治;晚稻病虫害化学防治意义大,每年需防治3~4次。
The effects of single plant diseases and insect pests on the yield of rice from 2005 to 2013 were analyzed. The results showed that the rate of rice loss in late rice was significantly higher than that of the early rice without prevention and control of major pests and diseases of rice. The main pests and diseases of early rice are not chemical control when the loss of large amount of rice, but less disaster, a single pest insects Chilo suppressalis, sheath blight caused more serious damage, planthopper, rice leaf roller in only a few years loss. The main pests and diseases of late rice do not carry out chemical control disaster frequency, and even caused by the absolute income, a single pest to planthopper caused by the harm, a significant impact on the yield. Benefit analysis results show that chemical pest control, early rice generally take 1 or 2 times, a few years may not be prevention and treatment; late rice pest and disease prevention and control of chemical significance, prevention and treatment of 3 to 4 times a year.