Abstract: Most arthropod predators and parasitoids also feed on sugar-rich foods including floral nectar, extrafloral nectar and arthropod honeydew besides preying orparasitizing arthropod hosts. These sugar-rich foods play important roles in enhancing their flight and host foraging ability, prolonging adult longevity, increasing fecundityand improving pest control capacity. In this article, we briefly introduced three common sugar-rich foods in agro-ecosystem including floral nectar, extrafloral nectar andhoneydew. Floral nectar and extrafloral nectar could significantly prolong and improve the longevity, fecundity and pest control capacity of most arthropod natural enemies,whereas honeydew could only improve the biological fitness of some natural enemies.  The successful applications of planting flowering plants and supplying sugar-rich foods onimproving biological control functioning in agro-ecosystem were also reviewed. Furthermore, the further research directions of sugar-rich foods, including screening nectarresource plants, clarifying the effects of sugars in sugar-rich foods and the mechanism of searching and locating the sugar-rich foods by natural enemies,  were discussed.

Key words: Arthropods, natural enemies, longevity, fecundity, sugarrich foods, pest control capacity, biological control