龙眼和荔枝卷叶蛾类种群动态及其群落结构

调查结果显示,在广西南宁市和崇左市的部分龙眼和荔枝园中,危害龙眼和荔枝的卷叶蛾类有3科20种,其中龙眼园的卷叶蛾类有3科16种,荔枝园有2科17种,2类果园发生的种类有所不同。20种中,9种过去尚未见报道。龙眼园和荔枝园卷叶蛾类群落结构的均匀度指数较低,分别为0.298 2和0.406 3,说明在群落中有某种卷叶蛾的种群数量相当大,各种类数量分布不均一,有某个种群数量相当大。2类果园卷叶蛾类群落的多样性相比,荔枝园要高于龙眼园。龙眼园卷叶蛾类的优势种为三角新小卷蛾Olethreutes leucaspisMeyrick(优势度指数d=0.813 2),荔枝园分别为三角新小卷蛾(d=0.722 6)和灰白条小卷蛾Dudua aprobola(Meyrick)(d=0.102 8)。2类果园种群数量较大的种类均为三角新小卷蛾、灰白条小卷蛾和圆角卷蛾Ebodo cellerigeraMeyrick。各月份卷叶蛾类发生的总数量均以龙眼园高于荔枝园。

Community structure of leaf rollers in longan orchard and litchi orchard

The community structure and the fluctuation of population of leaf rollers in parts of longan orchard and litchi orchard in Guangxi were studied.The results showed that there were altogether 20 species of leaf rollers belonging to 3 families,in which 9 species were not reported as a pest on longan or litchi in the past.There were 16 species of leaf rollers from 3 families in longan orchard,and 17 species of leaf rollers from 2 families in litchi orchard,respectively.The evenness indexes of community in longan orchard and in litchi orchard were 0.2982 and 0.4063,respectively.The results showed that the distributions of number of the different species were not uniform,and a certain species had a very vast number.The diversity index of community in litchi orchard was higher than that in longan orchard.The dominant species in longan orchard was Olethreutes leucaspis Meyrick,and the dominant species in litchi orchard were O.leucaspis Meyrick and Dudua aprobola(Meyrick).The main species in both two orchards were O.leucaspis.D.aprobola and Ebodo cellerigera Meyrick.The population size of leaf rollers in longan orchard was higher than that in litchi orchard.