用双环法诱杀松墨天牛成虫控制松材线虫病

利用松墨天牛趋性，在松墨天牛羽化期在松林内安置用“松枝，松木 诱杀剂”的双环装置，松枝诱杀补充营养的松墨天牛，松木诱杀产卵的松墨天牛，以减少松墨天牛对健康松树的补充营养和产卵，降低松材线虫病危害。结果表明，每个双环装置能诱杀松墨天成虫665.3头。上架成虫数量的日变化与月相有一定关系。在诱虫期内的3具凸月相的诱虫量为1116头，占总诱虫量的55.9%；时变化与光照强弱有关，18：00至22：00诱虫量占全天的70%，置架的松林地枯死松树减退率平均达79.6%，比对照林地枯死松树净减50.0%。松墨天牛对诱杀架有较强的趋性，在松林内安置诱杀架能有效地控制松材线虫病危害。图5表2参11。

Trapping adults ofMonochamus alternatus with chemically-treated pine logs and branches

The study was made in Ningbo City of Zhejiang Province，China．Anaverage of 665.3 adults of Monochamus alternatus in their emerge season was trapped by a set of trapping device built with “pine branches and logs＋attractant＋insecticide”．The number of adults trapped daily related to phases of the moon．When the phase was in bump，the number was more than half of the moon，i．e．at 11th or 21st of the lunar calendar，the number of adults trapped reached a peak of 55.9% of all adults trapped．The number of adults trapped hourly had something to do with intensity of the sunlight．At dawn，the number of adults trapped accounted for 14% ，in the evening（18：00－22：00）for 70％ of all day．The dead pine trees in the nematode-infected pine forests with trapping device decrased by 50％ comparing with checked pine forest without trapping device ．A trap rack arranged in the nematode-infected pine forest is effective to predict Monochamus alternatus and control Bursaphelenchus xylophilus．