矢尖蚧发生动态及其寄生性天敌

柑桔矢尖蚧在福建闽北地区一年发生3代。以雌成虫和部分若虫及少数雄蛹越冬．一龄幼蚧盛期，第一代为4月中，下旬。第二代7月上．中旬，第三代9月中旬前后。二龄幼蚧盛期．第一代为5月上、中旬，第二代7月下旬，和第三代9月下旬．后期世代重叠．福建已知寄生蜂6种．其中一种为重寄生蜂，以矢尖蚧黄蚜小蜂为优势种．寄生生蜂自然寄生率最高达49.1%。

POPULATION DYNAMICS AND PARASITOID COMPLEX OFTHE ARROWHEAD SCALE UNASPIS YANONENSIS (KUWANA)

Thc arrowhead scale Unaspis yanonensis(Kuwana)develops 3 generations in a year andoverwinters with females, a part of larvae and a few of male pupae in the north of Fujian Province. The oc-currence peaks of the first nymph instar are middle to late April in lst generation, early to middle July in 2ndgeneration, and middle September in 3rd generation respectively. However, the occurrence peaks of the sec-ond nymph instar are early to middle May in lst generation ,late July in 2nd generation ,and late September im 3rd generation respectively. 6 species of hymenopterous parasitoids on the arrowhead scale have have beenfound in Fujian Province,in which Marietta carnesi (Howard)is a hyporparasitoid and Aphytis yanonensisDeBach et Rosen is a dominant speeies. The parasitism of the parasitoids is up to 49.1%at the occurrencepeak.