食蚜瘿蚊对烟蚜及其蜜露的产卵选择性研究

Research on the oviposition selection of Aphidoletes aphidimyza(Rondani)

为了探究食蚜瘿蚊在烟蚜及其蜜露下的产卵选择性,研究了在不同密度烟蚜和不同密度烟蚜蜜露条件下食蚜瘿蚊的终身产卵量和产卵偏好性。结果表明,食蚜瘿蚊产卵期与烟蚜密度无关。但终身产卵量随着烟蚜密度的增加而逐渐增多。200头/株烟蚜是食蚜瘿蚊产卵量的最优密度。仅存烟蚜蜜露条件下,产卵期与终身产卵量均与不同烟蚜密度排泄的蜜露有关,在300头/株最大密度烟蚜排泄的蜜露下产卵量最高。而在烟蚜和蜜露共存时食蚜瘿蚊偏好在具有烟蚜的植株上产卵。

The lifetime oviposition and preference of Aphidoletes aphid imyza(Rondani)under different densities of tobacco aphids and their honeydew were studied to investigate its oviposition selection.The results revealed no significant effect of the tobacco aphid density upon the oviposition period of A.aphidimyza.However,the lifetime oviposition amount increased as the tobacco aphid density increased.The optimum density of tobacco aphids for oviposition of A.aphidimyza was 200 individuals per plant.In the condition that with honeydew only,both the oviposition period and lifetime oviposition of A.aphidimyza were related to the honeydew excreted by tobacco aphids in different densities.The number of eggs deposited by A.aphidimyza peaked under the honeydew produced by 300 tobacco aphids per plant.A.aphidimyza showed the oviposition preference on the plant with tobacco aphids more than that retain aphid honeydew only.This study provided a theoretical basis for understanding the biological characteristics of A.aphidimyza.