[目的]明确不同烟苗密度对烟蚜茧蜂[Aphidiusg ifuensis（ Ashmead）]繁殖的影响，提高繁蜂效果。[方法]采用4种密度（40、80、160、322株／盘）的烟苗繁殖烟蚜茧蜂，调查烟蚜[ Myzus pre sicae （ Sulzer）]繁殖量、烟蚜茧蜂寄生率和发病率、繁蜂生产成本。[结果]各处理的烟蚜、寄生蚜、僵蚜数量与烟苗密度的相关性表现一致，均随着烟苗密度的增加呈现先上升后下降的趋势；各处理在蚜霉病发病率上表现出较大差异，蚜霉病发病率与烟苗密度呈正相关；80株／盘密度的繁蜂效果最好。[结论]试验结果为毕节市烟蚜茧蜂繁育提供了理论依据。%Objective] To determine the effects of tobacco seedling density on the propagation of Aphidius gifuensis Ashmead., and to en-hance the propagation rate of A.gifuensis.[Method] Four densities (40, 80, 160 and 322 plants/dish) of tobacco seedlings were used to propagate A.gifuensis.Propagating quantity of tobacco aphids, parasitic rate and incidence rate of A.gifuensis, and production cost of propa-gation were investigated.[Result] Quantities of tobacco aphids, parasitic aphids and mummified aphids in each treatment had consistent cor-relation with tobacco seedling density.They all firstly enhanced and then declined with the increase of tobacco seedling density.There were great differences in the incidence rate of A.gifuensis.Density of 80 plants/dish had the best propagation effects.[ Conclusion] The research results provide theoretical basis for the propagation of A.gifuensis.
展开▼
