宁南县桑红蜘蛛习性研究

Analysis of occurrence and habits of Terancychus cinnabarinus Boisduval in Ningnan county of Sichuan

课题组对宁南县严重为害的桑红蜘蛛的发生规律和生活习性进行了系统的调查研究，查明桑红蜘蛛在宁南县一年发生16-18代以成虫在树干、落叶、杂草上越冬，一年有两个高峰期即3—5月份和晚秋；在桑树上的分布多在3—5叶，晚秋后主要在3—4叶；未翻耕的桑地及未刷干的桑树红蜘蛛较重，成片桑较轻，良桑重于石生桑；发育的适温范围是10-35℃，最适温度为30℃，临界低温和高温分别为8和36℃，与其他桑区的显著差异是越冬期很短，仅为20—25d，第一次发生高峰期较早。

It was carried out to investigate and research the occurrence and habits of Teranychus cinnabarinus Boisduval,which was extremely disadvantaged in Niugnan county of Sichuan province, the result showed Teranychus cinnabarinus Boisduval give birth to progeny of 16 to 18 generations in a year. Adult lived in the trunk and leaves disengaged from the tree of mulberry at most time,and lived in weeds for overwintering at rest time. There was two peak stage of the pest in the month from March to May,and later autumn in a year. The number of Teranychus cinnabarinus Boiaduval was the most in the field which ware unplowed and non-insolated,followed by those of numerous tree of mulberry and those grown in stone. The most suitable temperature was 30 ℃ among 10 ℃ to 35℃ for breeding,the lowest temperature and the highest temperature of death was 8 and 36℃ ,respectively,and possessing short overwintering stage of 20 to 25d was the obvious difference comparison to the rest area of mulberry,as a result it was early when the first peak stage of the pest broke out.