Some aphids feed on just one or two plant species. Eristalis tenax, the common drone fly, is a common, migratory, cosmopolitan species of hover fly. As soon as larvae were switched back to an aphid diet, they rapidly gained weight and some pupated after a few days. In some species, the hoverfly larvae are saprotrophs, which eat decaying plant and animal matter in the soil or in ponds and streams. , we analysed trends in different larval guilds and found that those hoverfly species with larvae that develop in cow-dung (e.g. The first generation of E. balteatus was provided by PK Nutzlingzuchten (Welzheim, Germany). The larvae of hoverfly Episyrphus (De Geer) are important predators for controlling the aphids in cruciferous vegetable fields in Hanoi. The larvae of the syrphids and both larvae and adult ladybirds are predators of aphids. They linger in gardens to feed at flowers and to seek shade. lower outer cross vein (see Fig. It has been introduced into North America and is widely established. Exceptions are found especially among the drone flies, where females differ from the males. Plants raised under each treatment are then presented to gravid hoverfly females in a dual-choice bioassay. Rhingia spp. This last year they kept the green house completely free of aphids and thrips. Wasp . They are an easy prey to attack. Many aphid species are monophagous (that is, they feed on only one plant species). They likely consume more than 1 million cereal aphids per hectare of arable cropland, the researchers report. hoverfly larvae (Plate 5). By controlling the population of other pests, they help in maintaining a healthy garden for you. We feature 61,000,000 royalty free photos, 343,000 stock footage clips, digital videos, vector clip art images, clipart pictures, background graphics, medical illustrations, and maps. Adults were reared in 100 x 60 x 60-cm cages and fed with pollen, honey, and sugar. Hoverfly larvae with their tiny heads are no match for the harlequin ladybirds, unfortunately; they lack the long pincers and swift legs of lacewing larvae (Fremlin, 2007a). Brachypalpus chrysites is a montane insect. Besides, they would always return to flowers that are affected to feed on the larvae of other dangerous pests. We further show that hoverfly locomotor activity is remarkably stable over the lifetime of the animals, and also resilient to the diet provided. Some larvae eat decaying plant or animal matter while others prey on garden pests such as aphids. Encyclopædia Britannica, Inc. Some of which include; leafhoppers, aphids etc. Although pupation and adult hatching rates were strongly reduced compared with hoverflies continuously fed with aphids, the consumption of non-prey food most probably increases the probability that hoverfly larvae find an aphid colony and complete their development.