矢尖蚧蚜小蜂种群数量动态及其自然控制作用

Population Dynamics of Aphytis Yanonensis and its control effects on arrowhead scale, Unaspis Yanonensis

矢尖蚧蚜小蜂(Aphytis yanonensis DeBach et Rosen)是矢尖蚧未产卵雌成虫的一种体外寄生蜂。主要以幼虫越冬。贵阳花溪地区7—8月和10—11月是该蜂发生的两个主要时期。寄生率叶片高于枝条、叶面高于叶背。全年的寄生率最高峰出现在11月、最低峰出现在6月。

Aphytis yanonensis DeBach & Rosen is a major ectoparasite of arrowhead scale, Unaspis yanonensis (Kuw.). It overwinters mainly in the larval stage. Field populations increased during the period from July to August and from October to November in Huaxi, Guiyang. The hightest parasitic rate appears in November and the lowest in June. The parasitic rate is higher on leaves than the twigs and higher on the obverse side than the reverse side of the leaves.