异色瓢虫不同龄期幼虫踪迹对受孕雌虫产卵的影响

Effect of conspecific larval tracks of different instars on gravid female of Harmonia axyridis(Pallas)

本文通过室内试验研究了异色瓢虫Harmonia axyridis (Pallas)不同龄期幼虫踪迹对受孕雌虫在猎物寄主上停留时间和产卵的影响。结果表明:受孕雌虫倾向于在猎物丰富的植株上停留。幼虫踪迹抑制了受孕异色瓢虫雌虫的停留时间,但2龄幼虫踪迹和4龄幼虫踪迹对受孕雌虫停留时间的影响差异不显著。异色瓢虫雌虫将卵产于有蚜虫的植株上,幼虫踪迹对受孕雌虫的产卵抑制作用显著,但2龄和4龄幼虫踪迹的抑制效果差异不明显。

Effect of conspecific larval tracks of different instars on gravid female of Harmonia axyridis were investigated in the laboratory.The results showed that gravid female would like to stay at the host plants with rich aphids.Larval tracks significantly affected the time staying of gravid female on host plants,however,there is no significant difference between restraining effect of 2nd larvae track and 4th larvae track.Gravid female also stayed at the plant contaminated with larval tracks,but flied away every now and then.Gravid female rarely stayed at the host plant without aphids to avoid the risk that newly hatched larvae having no food to eat.Gravid females of H.axyridis preferred to lay eggs on the host plant inoculated aphids.Gravid females were strongly deterred from ovipositing on plants contaminated with larvae tracks,however,there was no significant difference between restraining effect of 2nd larvae track and 4th larvae track.