纳曼干脊虎天牛的生物学特性研究

经调查纳曼干脊虎天牛 (Xylotrechus namanganensis Heydel.)在新疆北部危害钻天榆等近2 0种阔叶树,造成严重危害,在克拉玛依市一年发生 1代,以老熟幼虫在树干内越冬。每年 4月中旬至 7月中下旬都能见到成虫、卵和幼虫,各龄幼虫终年可见。

Studies on Biological Characteristics of Xylotrechus namanganensis

Xylotrechus namanganensis is endemic to Middle Asia subregion of Palaearctic region. It causes severe damage to about 20 broadleaved tree species in the north of Xinjiang and greatly weakens the growth vigor of infested trees and even causes the host trees to die.X.namanganensis has one generation per year in the area of Kelamayi, and overwinters as mature larva in the trunk. The adult,larva and egg can be found at the same time from mid April to mid or late July,or even through a year.Three kinds of parasitoids were found,among which Leluthia sp. might be a new species, Aspidocolpus erythrogaster Tobias is a new recored species in China, Zombrus sjostedti(Fahringer) is a new record species in Xinjiang.In addition ,three parasitic fungi were found in the bodies of larvae,pupae and adults of X.namanganensis, namely Beauveria bassiana, Fusarium solani and Aspergillus candidus.