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中文摘要：
【目的】多寄主对植食性昆虫寄主选择行为具干扰效应。为探究在田间相似寄主混作是否能引起小菜蛾Plutellaxylostella（L．）在寄主上的选择困难，减少在寄主上的产卵量，从而实现保护寄主植物的目标。【方法】本研究利用小菜蛾喜好性高的两种寄主（菜心BrassicacampestrisL．和芥菜B．junceaCoss）为试验对象，通过寄主植物单作、混作及不同配比与间隔种植等田间试验设计，研究了多寄主对小菜蛾寄主选择行为的干扰效应。【结果】在2年的田间试验中，两寄主混作处理上的虫量均低于单一寄主种植；2012年田间种群生命表数据显示，两种寄主田间混作处理上的小菜蛾种群趋势指数（I=4．797）低于单一寄主种植，菜心与芥菜单一种植处理上的，值分别为6．549与6．858；当菜心与芥菜这两种小菜蛾喜好性相近寄主同时存在时，对小菜蛾的干扰程度与两寄主的搭配比例有关，随着菜心所占比重的增大，田间虫量呈现先减后增的抛物线变化趋势；但两寄主间距在2m内时，不同种植间隔对小菜蛾虫量变化无差异（F3.8=0．204，P〉0．05）。【结论】结果表明，在田间多寄主种植中，除了可利用陷阱作物来防控小菜蛾外，在相邻两畦地间以适当比例同时种植两种小菜蛾喜好性相近的寄主，利用两种寄主植物对植食性昆虫的寄主选择行为产生的干扰效应，也能有效影响田间小菜蛾的种群动态。
英文摘要：
[ Aim ] Herbivorous insects may have for food and oviposition sites in the presence of difficulty in decision-making relative to selection of hosts multiple suitable hosts. Such potential interference with host selection may affect population dynamics. The objective of this study was to test the hypothesis that mixed populations of similar hosts would suppress population densities of the diamondback moth （ DBM）, Plutella xylostella （L.）. [ Methods] A randomized complete block （RCB） experimental design with 3 treatments was established in a field naturally infested with DBM. Treatments included mixed cultivation of Brassica campestris L. and B. juncea Coss, both of which are favorable hosts for DBM, and monocultures of either host. Moreover, mixed cultivation with different ratios of B. campestris to B. juncea and different intervals between the two hosts were established in the field also naturally infested with DBM. [ Results ] The population densities of DBM in mixed cultivation were significantly lower than densities on monocultures of either host （ F2,7 = 14.409 and 6.400 in 2010 and 2012, respectively, P 〈 0.05）. A population life table in 2012 yielded the population trend indexes （I） for DBM on B. campestris （I = 6. 549） or B. juncea （I = 6. 858） that were greater than the values on mixtures of the two hosts （I = 4. 797）. With B. campestris density increasing, the population densities of DBM first decreased and then increased. No differences were observed among population densities on hosts in mixtures at different intervals within 2 m （ F3.8 = 0. 204, P 〉 0.05 ）. [ Conclusion ] Population densities of DBM are lower on mixtures of favorable hosts, which is consistent with the hypothesis that insuch situations the ability of insects to select a host is diminished. This phenomenon may have application value for management of DBM.
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