七十年代以来,褐稻虱已成为我县晚稻上常发性主要害虫,严重威胁晚稻高产稳产。对于褐稻虱的防治策略和防治指标近几年来各地都相继开展了研究,随着水稻病虫综合防治水平的提高,如何制定切实可行的经济防治指标,以获得较大的经济效益是当前植保工作者研究的重要课题。1981—1983年,我们就晚稻褐稻虱不同生育期,不同虫量为害损失率及防治指标进行了初步研究,现将结果整理于后。 Since the seventies, brown planthopper has become the main perennial insect pests in late rice, a serious threat to the late rice high and stable yield. For the brown planthopper control strategy and prevention and control indicators in recent years all over have carried out research, with the prevention and control of rice pest levels increased, how to develop practical indicators of economic control in order to obtain greater economic benefit is the current plant protection Workers study the important topic. In 1981-1983, we conducted a preliminary study on the loss rate and control index of late rice brown planthopper, Nilaparvata lugens at different growth stages and different insect populations, and summarized the results.