棉铃虫齿唇姬蜂生物学特性及田间控制作用研究

BIOLOGY OF CAMPOLETIS CHLORIDEAE [HYM.:ICHNUMONIDAE] AND ITS FIELD CONTROL EFFECT ON COTTON BOLLWORM

棉铃虫齿唇姬蜂在河南新乡棉区年发生约8代,以6个世代发生在棉田,其中4个世代与棉铃虫低龄幼虫发生期吻合。田间出现4个寄生高峰,分别在5月中旬、6月中下旬,7月底至8月初,8月底至9月初,寄生率平均在19.2～42.9％,以一、二代棉铃虫期的寄生率较高,齿唇姬蜂对3龄前棉铃虫幼虫的总寄生率平均为23.7％,最高达40.0％,占整个世代总寄生数的71.3％。该蜂是豫北棉铃虫寄生性天敌中的优势种。成蜂对菊酯类农药敏感。

Field studies indicated that there were eight generations of Campoletis chlorideae in a year in Xinxiang, Henan Province, of which six generations were spent in cotton fields. The occurrence of four generations coincided with that of early instar cotton bollworm (Heliothis armicreral larvae. Four peaks of bollworm parasitization by C. chlorideae were observed in mid-May, Mid- to late June, late July to early August, and late August to early September, respectively. Parasitization ranged from 19.2-42.9%, with the highest parasitization occurred in the 1st and 2nd host generations. The mean parasitic rate before the 3rd bollworm instar was 23.7% (max. 40.01%), which accounted for 71.3% of the total parasitization in a full host generation. The wasps were found to be sensitive to permethroids. The results showed that this parasitoid was the dominant natural enemy of cotton bollworm in northern Henan Province.