摘要 : Rice planthoppers (mainly <i>Nilaparvata lugens</i> (Stal) and <i>Sogatella furcifera</i> Horvath) are the most destructive rice pests throughout southeastern and eastern Asia. Planthopper feeding often causes "hopper burn" and re... 展开 Rice planthoppers (mainly <i>Nilaparvata lugens</i> (Stal) and <i>Sogatella furcifera</i> Horvath) are the most destructive rice pests throughout southeastern and eastern Asia. Planthopper feeding often causes "hopper burn" and reduces rice yields. Currently, insecticide use is the sole pest management option available to most Chinese farmers. Because pesticide use may have undesirable effects, environmentally sound and sustainable management alternatives are urgently needed. In a two-year field study at the Wuyishan Experimental Station of the Institute of Applied Ecology (IAE), Fujian Agriculture and Forestry University (FAFU), we evaluated the effects of polycultural manipulation on the abundance, sexual differentiation and wing dimorphism of rice planthoppers. The polycultural manipulation was arranged in mosaic patterns of paddy plots intercropped with non-paddy plots including chili pepper, ginger, maize and peanut plants. Monocultural fields of paddy plants were used as controls. Polycultural manipulation significantly reduced the abundance of total planthoppers and nymphs of <i>N. lugens</i> and <i>S. furcifera</i>. The number of overall planthoppers decreased on average by 49% and 55% in 2007 and 2008, respectively. However, polycultural manipulation had no impact on the proportions of female or macropterous planthoppers. The resource concentration and associational resistance hypotheses may explain these results. In polycultural fields, non-rice species may mask the chemical or visual attractants of rice, making them less apparent, and microhabitat differences in the levels of secondary compounds or in plant quality may also disrupt planthopper orientation.Digital Object Identifier http://dx.doi.org/10.1016/j.cropro.2010.11.013 收起