十一星瓢虫的生物学特性

Biological Characters of Coccinella undecimpunctata Linnaeus

对十一星瓢虫的生物学特性进行观察研究,结果表明:十一星瓢虫成虫捕食量为127 头/d,幼虫1～4龄的捕食量分别为11,79,166,181 头/d.每头雌虫产卵25～79粒/d,平均为44粒/d.在28±1 ℃条件下,卵期为2.3 d;幼虫发育历期1龄为2.0 d,2龄为0.7 d,3龄为0.9 d,4龄为2.1 d;蛹期为3.5 d,世代发育历期为11.5 d;成虫飞翔能力强,具有明显的群集越夏特性;冬季成虫栖息在树皮缝隙中或枯枝落叶下,在-15 ℃的气温下,成虫仍能安全越冬.

Beneficial ladybugs are the important natural enemies in the world, and many species of ladybugs are extensively distributed. Coccinella undecimpunctata Linnaeus are mainly distributed in Gansu Province, Ningxia Hui Autonomous Region and Xinjiang Uygur Autonomous region in China, and are a preponderant species in cotton fields in south Xinjiang. In this paper, the biological characteristics of Coccinella undecimpunctata Linnaeus in Xinjiang are researched. The results show that an adult of Coccinella undecimpunctata Linnaeus can arrest 127 aphides a day, lst～4th larvae can arrest 11, 79, 166 and 181 aphides a day respectively. A female adult of Coccinella undecimpunctata Linnaeus can oviposit 25～79 spawns a day 44 spawns in average. The egg stage of Coccinella undecimpunctata Linnaeus is 2.3 days under temperature of 28 ± 1 ℃ , 1st, 2nd, 3rd and 4th larva stages are 2.0, 0.7, 0.9 and 2.1 days respectively. The pupa stage is 3.5 days, and the generation development duration is 11.5 days. The adults of Coccinella uTzdecimpunctata Linnaeus have powerful migration capability. Coccinella undecimpunctata Linnaeus like to gather into groups to live through summer. The adults perch in the bark apertures to live safely through winter at temperature of - 15℃.