杏球蚧发生危害及其寄生蜂的初步研究

Preliminary studies on the occurrence and parasitic wasps of Didesmococcus koreanus Borché in Xining area

对西宁地区杏球蚧的发生危害和其寄生蜂进行了观察。结果表明,西宁地区杏球蚧1年发生1代,以2龄若虫在杏、海棠等的枝条上越冬;6—7月是主要危害期,杏树被害最重,虫枝率达84%。鉴定出7种杏球蚧寄生蜂,其中白蜡虫花翅跳小峰、日本软蚧蚜小蜂、螟蛉裹尸姬小蜂是西宁地区杏球蚧寄生蜂的优势种类,分别占寄生蜂总种群数量的32%、18%、17%。介壳平均寄生率10%以上。

The paper reported the occurrence and parasitic wasps of apricot globular scale （Didesmococcus koreanus Borche＇） in Xining area. The results indicated that the scale had one generation in each year and overwintered on the branches of trees of apricot （ Prunus armertiaca L. ） ＆ crabapple （ Malus spectabilis Borkh ） by the 2^nd instar nymph. During the occurrence period of the scale from June to July, apricot was mcrst heavily damaged, the ratio of damaged branches was 84%. There are 7 species of parasitic wasps of the scale, among them 3 were dominant species： Microter ysericeri lsill, Coccophaugus japonicus Compere and Euplectrus sp., their ratios of one species population quantity/all species populations quantity were 32%, 18% and 17% respectively. The mean ratio of parasitism of the wasps on the scale was over 10%.