赤眼蜂防治小菜蛾适宜蜂种或品系的筛选(英文)

以控制小菜蛾为目的，在实验室对２９种赤眼蜂或品系进行了筛选。筛选评价根据５项指标：（１）能在小菜蛾卵上产卵的雌蜂比例，（２）每雌蜂寄生卵量，（３）子峰在每粒寄主上的存活率，（４）羽化率，和（５）子代性比。研究结果表明：有２３种赤眼蜂或品系能够寄生小菜蛾卵，但无论在种间还是品系间均存在很大差异。根据５项筛选指标综合评价，２９种中较好的为：前苏联的Ｔｒｉｃｈｏｇｒａｍｍａ ｔｒｊａｐｉｔｚｎｉ，美国的Ｔ．ｐｒｅｔｉｏｓｕｍ，法国的Ｔ．ｎａｇａｒｋａｔｔｉｉ，中国台湾的Ｔｒｉｃｈｏｇａｒａｍｍａｔｏｉｄｅａ ｂａｃｔｒａｅ，中国广东的Ｔ．ｃｈｉｌｏｎｉｓ和法国的一个种Ｔ．ｓｐ。其中美国的Ｔ．ｐｒｅｔｉｏｓｕｍ，中国台湾的Ｔｒｉｃｈｏｇａｒａｍｍａｔｏｉｄｅａ ｂａｃｔｒａｅ，中国广东的Ｔ．ｃｈｉｌｏｎｉｓ可以考虑作为大田防治小菜蛾的首选蜂种。田间筛选及大田验证试验正在进行之中。

SELECTION OF TRICHOGRAMMA SPECIES FOR CONTROLLING THE DIAMONDBACK MOTH,PLUTELLA XYLOSTELLA(L.)

The parasitization of twenty-nine species or strains of Trichogramma and Trichogrammatoidea on the eggs of diamondback moth (DBM), Plutella xylostella (L.), was tested in the laboratory. Five indexes were evaluated: proportion of female wasps of egg-laying, the number of parasitized host eggs by each female wasp, survival ratio of progeny in each host-egg, emergence ratio and sex ratio of offsprings. The results showed that 23 species or strains were able to parasitize the eggs of DBM and significant difference was found not only between species but also between strains. According to the five indexes, T. trijapitzni (from former USSR), T. pretiosum (from USA), T. nagarkattii (from France), Trichogrammatoidea bactrae(from Taiwan, China), T. chilonis (from Guangdong, China),and T. sp. (from France) showed better performance, among which T. pretiosum, Trichogrammatoidea bactrae and T. chilonis(Guangdong)were considered as suitable candidates to control DBM in the field.