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我县地处海南岛东部,气候温和,终年无霜雪,历年最冷的1月平均为17.7℃。年降水2,100毫米左右,月平均相对湿度均在80％以上,是双季稻、三季稻、三熟制(稻、稻、晚秋薯和冬薯、稻、稻)混栽区。稻纵卷叶螟是我县重要水稻害虫之一,严重时在水稻孕穗、抽穗期,被害损失率可高达40％左右。我站作了些调查研究工作,特别是1976—1977年对其发生规律进行系统调查和室外饲养观察,现将结果整理如下。
My county is located in the eastern part of Hainan Island, a mild climate, frost-free throughout the year, the coldest month in January average of 17.7 ℃. Annual precipitation of about 2,100 mm, the monthly average relative humidity above 80%, is double cropping rice, three cropping rice, three cooked system (rice, rice, late autumn potato and winter potato, rice, rice) mixed planting area. Rice leaf roller is one of the important rice pests in our county, in severe booting, heading, the loss rate of victims up to 40%. I have made some investigations and studies, especially from 1976 to 1977 to conduct a systematic survey of its occurrence and outdoor rearing observations, the results are summarized below.