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水稻螟虫在我区很普遍,每年从3月到11月发生,危害早、中,晚稻,造成枯心和白穗,对粮食增产威胁很大。1962年个别螟害严重的地方,损失产量达22.5％。就全自治区来说,1963年的螟害比1962年又有所回升,据三十四个县的典型调查,去年晚稻白穗率在5％以上的就有五个县。这说明加强对这种害虫的防治,应该列为今年争取丰产丰收的重要措施之一。螟虫发生趋势的一般规律螟虫的发生趋势,是有效地防治螟害所
Rice stem borers are very common in our district and occur from March to November every year, endangering the early, middle and late rice crops, resulting in dry and white spikes, which threaten the increase of grain output. In 1962, individual stem borer severely damaged areas, yield loss reached 22.5%. For autonomous regions, the boreal damage in 1963 rose again from 1962. According to the typical survey conducted in 34 counties, there were five counties with more than 5% of white spike in late rice last year. This shows that strengthening prevention and control of such pests should be listed as one of the important measures for bumper harvests this year. The general trend of occurrence of stem borers The trend of occurrence of stem borers is an effective control of stem borer