福建柑桔矢尖蚧天敌种类调查及田间消长研究

本文对福建省柑桔矢尖蚧的天敌种类进行了调查,发现有寄生性天敌6种、捕食性天敌5种.对最为常见的矢尖以黄蚜小蜂Aphytis yanonensis和镞盾蚧黄蚜小蜂Aphytis unaspidis的寄生率消长动态、日本方头甲Cybocephalus nipponicus和整胸寡节瓢虫Telsimia emarginata幼虫的田间数量消长进行了系统观察.建议可从四川等地引入褐黄异角蚜小蜂Coccobius fulvus,以提高天敌对矢尖蚧的综合控制效能.

INVESTIGATION ON NATURAL ENEMIES OF THE ARROWHEAD SCALE (Unaspis yanonensis Kuwana) AND THEIR FIELD FLUCTUATIONS IN FUJIAN

Based on the field investigation on natural enemies of the arrowhead scale in Fujian Province from 1987 to 1998, 6 parasitoids and 5 predators are found. The parasitoids are A-phytis yanonensis DeBach et Rosen, Aphytis unaspidls Rose et Rosen, Encarsia citrinus (Craw) , Marietta earnesi (Howard) , Arrhenophagus chinoaspidis Aurivillius and an encyrtid. The predators are Cybocephalus nipponicus Endrody-Younga, Telsimia emarginata Chapin, Chilocorus kuwanae Silvestri, Scymnus sp. and Chrysopa boninensis Okam. The rates of parasitism of A-phytis yanonensis and Aphytis unaspidia, as dominant species, can reach 64% in mid July and 24. 7% in late July, 15. 5% and 5. 5% on average in a year, respectively. Cybocephalus nipponicus and Telsimia emarginata are major predators, which peaks of abundance of larvae are appeared in June-September.