脊胸天牛(Rhytidodera bowringii White)在杧果树枝干的分布研究

本文研究了果树害虫脊胸天牛(Rhytidodera bowringii White)在云南景谷县果国内对果树枝干的分布和危害情况。结果表明,该害虫在三年和象牙树上主要危害3~5年生枝条,其有虫枝率分别为65.3%和92.0%。另外,按地形将果园分为上、中、下三个区带,分别调查各区活枝、地面枯枝和腐枝中的害虫。结果显示,中区活枝、枯枝、腐枝的有虫枝率分别为60.0%,30.0%和17.0%,其有虫枝率分别高于果园的上区和下区。总体上看,三个区带活枝、枯枝和腐枝的有虫枝率分别为56.8%,34.0%和14.3%。定期清除果国内的枯枝和腐枝是防治脊胸天牛的有效措施之一。

A STUDY ON THE DISTRIBUTION OF RHYTIDODERA BOWRINGII WHITE ON BRANCHES AND STEMS OF MANGO TREES

This paper deals with the distribution and infestation of the branch borer Rhytidodera bowringii White in mango orchards of Jingu. The research results show that the pests mainly infest the tree branches of Sangnian mango and Shiangya mango reaching 3 to 5 years old. And the rates of the pest carrying branches are 65.3% and 92.0% respectively. In another way, we divided the orchard into upper, middle and lower areas. In each area, we dissected all the sample branches including the living, the withered and the decayed. The results show that the pest carrying rates of the middle area are respectively 60%, 39% and 17% with the living, the withered and the decayed sample branches. With all the living sample branches from 3 areas of the orchard, the pest carrying rate appears as 56. 8%, that of the withered 34.0%, and that of the decayed 14.3%. Therefore, one of the effective control measures against this mango branch borer should be timely removing all the withered and decayed branches from the orchard, and to be treated with.