This photo shows a hoverfly of Mesembrius tuberosus Curran (Diptera: Syrphidae) visiting Luffa cylindrica (Cucurbitaceae) flower, feeding on pollen and nectar. In larval stage, predatory hoverflies mainly prey on aphids and are effective natural enemies against aphids, scale insects, whiteflies, leafhoppers, thrips, lepidopteran neonatal larvae, etc. In adult stage, they feed on pollen and nectar of flowering plants as their main nutritional supplement, which may significantly extend their lifespan and increase their fecundity. In the previous issue (pp. 979-990), a review of the effects of sugar-rich foods on the longevity, fecundity and pest control capacity of arthropod natural enemies was reported. Photo by ZHU Ping-Yang at Jinhua Regional Station of the National Major Agricultural Pests Monitoring Network, on June 3, 2014.