【摘要】 稻显纹纵卷叶螟Cnaphalocrocis exigua(Butler)是稻纵卷叶螟Cnaphalocrocis medinalis(Guenée)的近缘种,目前主要在我国西南稻区发生为害。为了明确稻显纹纵卷叶螟在四川省犍为县冬后的虫源状况,我们开展了稻显纹纵卷叶螟冬后虫源结构调查,观察了冬后种群的生物学特性,并研究了温度对其的影响。结果显示,犍为县舞雩乡和罗城镇稻显纹纵卷叶螟冬后虫源密度分别为7.09头/25丛和5.50头/25丛。调查时稻显纹纵卷叶螟主要以蛹为主,有少量幼虫。稻显纹纵卷叶螟越冬代雌雄蛹重分别为11.56 mg和11.82 mg,性比(雌∶雄)为1.29∶1,蛹被寄生率为16.5%。20℃、22℃、24℃和室温下稻显纹纵卷叶螟越冬代蛹羽化率分别为44%、38%、52%、43%。不同温度下,稻显纹纵卷叶螟产卵量及成虫寿命无显著差异。本研究结果对于开春稻显纹纵卷叶螟的防控具有指导意义。更多还原

【Abstract】 Cnaphalocrocis exigua, a closely related species of Cnaphalocrocis medinalis, widely distributed in the paddy field of southwestern China. In order to understand the population status of C.exigua after overwintering in Qianwei county, Sichuan province, population structure of C.exigua after overwintering was surveyed, the biological characteristics were observed, and influence of temperature on its biological characteristics was also investigated. The results showed that the population densities of C.exigua in Wuyu and Luocheng were 7.09 and 5.50 individuals per 25 tillers after winter, respectively. During the investigation, the pupa was the main type, with a small number of larvae. The weight of overwintering female and male pupae of C.exigua was 11.56 mg and 11.82 mg, respectively. The sex ratio(female∶male) was 1.29∶1, and the pupa parasitism rate was 16.5%. The emergence rates of overwintering pupae were 44%, 38%, 52% and 43% at 20℃, 22℃, 24℃ and room temperature, respectively. There was no significant difference in egg number and adult longevity under different temperature conditions. The above results have guiding significance for the control of C.exigua in early spring rice filed.更多还原