西双版纳州桔小实蝇、瓜实蝇和南瓜实蝇种群动态监测

2001年至2003年连续3年在西双版纳州景洪、勐龙和打洛,用Steiner诱捕器和Mcphail诱捕器内加各种引诱剂和诱饵诱集各种实蝇,严密监测实蝇种群发生动态。监测结果表明,实蝇在西双版纳常年发生。桔小实蝇(Bactrocera dorsalis)属于绝对优势种,瓜实蝇(B.cucurbitae)和南瓜实蝇(B.tau)次之。3个诱集点实蝇种群动态基本一致,种群数量发生高峰期集中在5月底至7月初,从5月初至6月中旬,田间种群数量一直处于上升状态,并保持较高的种群数量,9月以后种群数量急剧下降。分析表明,3个诱集点诱集的实蝇种群数量差异不大,年度间的种群数量变化较小。芒果和龙眼是当地实蝇喜好的寄主水果,其种植面积、挂果期和产量对桔小实蝇种群数量变动影响较大,是影响该地区实蝇种群变动的又一主要因素。此外,气温、降雨等也影响西双版纳实蝇种群数量的变动过程。

Population dynamics of Bactrocera dorsalis,B.cucurbitae and B.tau(Diptera:Tephritidae) in Xishuangbanna

Annual monitoring was conducted on the population dynamics of the oriental fruit fly,Bactrocera dorsalis,B.cucurbitae and B.tau((Diptera: Tephritidae) through lure-traps all year around from 2000 to 2003 in Jinghong,Menglong and Daluo of Xishuangbanna Prefecture.The results indicated that fruit fly occurred year-round in Xishuangbanna.Bactrocera dorsalis was the absolute dominant species,B.cucurbitae and B.tau took the second place.The population dynamics has similar trend at three sites.The increasing peak appeared from the end of May to at the beginning of July.The amount of population went up from end of May to mid of June,and the amount of population was relative higher.After that,the fly population declined remarkably after September.The data analyses indicated that the amount of fly population had no significant difference among three sites,and there had no significant difference among years at the same site.Mango and longan were the main favorite host species of the fly in Xishuangbanna,so the planted areas,fruiting period and productions exerted essential effects on the fly population fluctuations.Besides that,temperatures and rainfall influenced the population dynamics of the fruit fly in Xishuangbanna.