杨桃园桔小实蝇的防治适期研究

杨桃园桔小实蝇种群数量动态具有明显的规律,且与杨桃果实的成熟期密切相关。通常3月实蝇种群数量开始上升,4月～10月为发生盛期,其间出现3～4个发生高峰,11月次至年2月虫量较低。桔小实蝇对杨桃果实的成熟度具明显选择性,偏好硬度(成熟度)在89度以下的果实。单个果实中约有6个产卵孔、30头幼虫,杨桃从被害到落果时间长度一般为9d。经分析,发现产卵孔数和落果中的幼虫数量、产卵孔数与落果时间长度之间显著相关,建立了两者间关系方程。在以上研究基础上,确定了杨桃园桔小实蝇防治的一些关键时期。

Study on optimal time for controlling Bactrocera dorsalis(Hendel)in carambola orchard

The population dynamics of oriental fruit fly Bactrocera dorsalis in carambola orchard in Guangzhou was determined and revealed by method of systematic investigation.The result showed that the population fluctuation was related to the developing period of carambola,and oriental fruit fly population densities were always higher when carambola was at fruit stage.The pest population increased on March,and showed 3-4 peaks from April to October,then kept low level from November to the next February.The adults preferred to the fruit with hardness below 89.The damaged fruit would drop down in 9 days when there were 6 ovipositing holes and 30 larvae in one fruit.The correlation was significant between ovipositing holes and larvae quantity,ovipositing holes and duration for damaged fruit dropping-down.Based on above results,the optimal times for controlling Bactrocera dorsalis(Hendel)in carambola orchard were presented.