SYRPHID FLIES Diptera: Syrphidae Syrphus Spp., Allograpta Spp. DESCRIPTION LIFE HISTORY IMPORTANCE

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SYRPHID FLIES Diptera: Syrphidae Syrphus Spp., Allograpta Spp. DESCRIPTION LIFE HISTORY IMPORTANCE

Modified from Ralph E. Berry. 1998©. Insects and Mites of Economic Importance in the Northwest. 2nd Ed. 221 p. SYRPHID FLIES Diptera: Syrphidae Syrphus spp., Allograpta spp. ___________________________________________________________________________ DESCRIPTION Adults are 10 to 12 mm long marked with yellow, black, or white bands resembling bees or small yellowjackets. They fly swiftly and tend to hover over plants (also call hover or flower flies). Adults feed only on pollen, nectar, or honeydew produced by aphids. Larvae are about 12 mm long, wrinkled or slug-like, and tapered to a point anteriorly. They are usually brown or green with whitish areas. Eggs are chalky-white with faint longitudinal ridges and are laid singly among aphid colonies. Syrphid fly adult LIFE HISTORY Syrphid flies overwinter as pupae in the soil. Adults begin emerging in April and May about the same time as aphid populations begin to increase. They lay eggs on leaves and stems of plants infested with aphids or other suitable prey. Eggs hatch in 3 to 4 days into soft-bodied maggot-like larvae. Larvae feed for 7 to 10 days, then drop to the soil to pupate. A life cycle from egg to adult is completed in 16 to Syrphid fly larva 28 days and there are three to seven overlapping generations each year. SYRPHID FLIES IMPORTANCE PUPAE Larvae feed on soft-bodied insects, particularly ADULTS aphids. As many as 400 aphids may be consumed by EGGS one larva during its development period. Larvae LARVAE seize aphids with their mouth hooks and suck out the PUPAE body contents. These predators are common in most J F M A M J J A S O N D field and vegetable crops and may be important in Months suppressing aphid populations if unnecessary applications of nonselective insecticides are avoided. Two common species of syrphid flies occur in the northwest: the western syrphid, Syrphus opinator and Return to Insect List Scaeva pyrastri..

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