部分自然因子对烟蚜种群增长的影响

Effects of Several Natural Factors on the Dynamic Population of Myzus persicae

为探究陇县烟区部分自然因子对烟蚜种群增长的影响。通过大田调查及数据统计分析,对烟蚜种群增长影响的部分自然因子进行研究。结果表明,叶位、天敌、叶片正背面、降雨等因子均可不同程度地影响烟蚜自然种群动态。烟蚜种群变化取决于若蚜量、1～4叶位叶耳及背面下部区域烟蚜量的变化;初期天敌对烟蚜控制作用不明显;叶耳部位由于位置及形状限制,是烟蚜防治后再次发生的重要源头;短期降雨不能有效降低烟蚜种群数量。

To investigate the factors which influence the natural populations of Myzus persicae, field survey was effectively employed to obtain the effects of influential factors. Through the survey and the data processing, we can conclude that factors including leave positions, natural enemies, rainfall and so on, to some degree, had effects on the natural population dynamics of M. persicae. The popu- lation dynamics of M. persicae depended on the change of nymph amounts, and aphid amounts on au ricles and the lower back-sides of 1st to 4th leaves; in the beginning, natural enemies did not show remarkable effects on the control of aphid;the location and shape of auricle played a key role in the resurgence of M. persicae; short-term rainfall could not effectively reduce tobacco aphid amounts.