Whiteflies are major pests on several vegetable and ornamental crops. Landing behaviour is strongly influenced by wavelength (nm) of reflected light from ground and surrounding vegetation. This paper deals with manipulation of whitefly landing behaviour in semi-field greenhouse experiments using background foils, either white foils with high reflection of short wavelength radiation or green foils reducing contrast between target plants and background (soil). The reactions of two different whitefly species were compared to detect possible differences between specialist (Aleyrodes proletella) and generalist (Trialeurodes vaporariorum) species. Dual-choice experiments were performed in a greenhouse using ice-lettuce, Lactuca sativa var. capitata (T. vaporariorum) and broccoli, brassica oleracera var. Italica P (A. proletella) as model plants. The results show strong impact of the white reflective foil in controlling landing behaviour of both species, whereas the effect of the contrast-minimising foil was much lower. Light influence was stronger on generalist than on specialist species. Mechanisms behind these effects and opportunities for inclusion in an integrated pest management strategy are discussed.

粉虱是几种蔬菜和观赏作物的主要害虫。着陆行为受到地面和周围植被反射光的波长（nm）的强烈影响。本文涉及在使用背景箔的半田温室实验中操纵粉虱的行为，背景箔要么是短波长辐射的高反射白色箔，要么是绿色箔，其降低了目标植物与背景（土壤）之间的对比度。比较了两种不同粉虱物种的反应，以检测专长（Aleyrodes proletella）和通才（Trialeurodes vaporariorum）物种之间的可能差异。使用生菜Lactuca sativa var在温室中进行双重选择实验。卡塔塔（温室白粉虱）和西兰花，甘蓝oleracera变种。Italica P（A. proletella）作为模型植物。结果表明，白色反射箔在控制两个物种着陆行为方面均具有强烈影响，而对比度最小化箔的效果要低得多。光对通才的影响比对专业物种的影响更大。讨论了这些影响背后的机制以及纳入有害生物综合治理战略的机会。