OutlawFlies East Asia South Asia Southeast Asia

Spotted-Wing Drosophila

Drosophila suzukii

Major invasive soft-fruit pest. Lays eggs INSIDE firm ripe intact fruits using SERRATED ovipositor.

Curated and rated by Sheriff Six-Legs and The Wild Pest field team · Six Legs Score™ (82/100, Outlaw tier) · Published Apr 25, 2026 · Updated Apr 28, 2026 · Released CC BY 4.0

82Six Legs

Six Legs Score™

82 / 100

The spotted-wing drosophila is one of the most economically destructive INVASIVE FRUIT PESTS to emerge in the past two decades — first detected outside its East Asian native range in California in 2008, the species has spread rapidly across NA, Europe, South America, and Africa, becoming a major pest of soft-fruit production worldwide (cherries, strawberries, raspberries, blackberries, blueberries, grapes). Unlike the closely-related vinegar flies (Drosophila melanogaster — which feed on overripe and rotting fruit), spotted-wing drosophila has a SERRATED OVIPOSITOR that allows females to lay eggs INSIDE FIRM, RIPE, INTACT FRUITS — making the species a primary pest of marketable fruit rather than a secondary pest of damaged fruit.

Spotted-Wing Drosophila — Wikimedia Commons · CC BY-SA 4.0

Size

Adult 2-3 mm

Lifespan

Adult 4-6 weeks; larva inside fruit 5-7 days; multiple generations per year

Range

Native to Southeast and East Asia; invasive across NA, Europe, South America, Africa since 2008

Diet

Adult: fruit juices, nectar. Larva: developing fruit flesh of cherries, strawberries, raspberries, blackberries, blueberries, grapes, other soft fruits.

Found in

Soft-fruit orchards and gardens worldwide — cherry orchards, berry farms, vineyards, suburban backyard fruit plantings

Field guide

Drosophila suzukii — the spotted-wing drosophila — is one of the most economically destructive INVASIVE FRUIT PESTS to emerge in the past two decades and one of about 1,500 species in family Drosophilidae (the 'vinegar flies' or 'fruit flies' — the same family that includes the lab-model species Drosophila melanogaster, used in genetics research). The species is native to Southeast and East Asia (Japan, Korea, China — where it has occurred at low densities for centuries) but exploded into global invasion in 2008 — first detected in California in 2008, then rapidly spread across NA, Europe (since 2008), South America (since 2013), and Africa (since 2014). Adults are 2-3 mm long, with the typical Drosophila body plan: tan-yellow body, large red compound eyes, and (males only) the species' diagnostic feature: SINGLE DARK SPOT on the front edge of each forewing (the 'spotted-wing' source of the common name; females lack the wing spots and require examination of the serrated ovipositor for definitive identification). The species' major significance comes from the OVIPOSITION BIOLOGY. Most Drosophila species (especially the lab-model Drosophila melanogaster) feed and oviposit on OVERRIPE, ROTTING, OR DAMAGED FRUIT — they are essentially scavengers of decomposing fruit and are a NUISANCE rather than a primary pest because they only attack fruit that is already past commercial value. Spotted-wing drosophila is dramatically different: females have a SERRATED OVIPOSITOR (the egg-laying tube has small saw-like teeth along the edges) that allows them to PIERCE INTACT FIRM FRUIT SKINS and LAY EGGS INSIDE FIRM, RIPE, INTACT FRUIT. Larvae develop inside the fruit over 5-7 days, tunneling through the fruit flesh and rendering the fruit unmarketable, with the damage often invisible from outside until the fruit is harvested and inspected. The species is therefore a PRIMARY PEST of marketable soft fruit (rather than a secondary pest of damaged fruit), causing far greater economic damage than typical Drosophila. Major economic crop hosts include: CHERRIES (the species' first commercial impact in California in 2008-09), STRAWBERRIES, RASPBERRIES, BLACKBERRIES, BLUEBERRIES, GRAPES, and many other soft fruits. The species is the focus of major USDA, EPA, and international fruit industry control programs since 2008 — including bait sprays, cultural management (sanitation of dropped fruit, exclusion netting), pheromone trapping, and (most recently) STERILE INSECT TECHNIQUE programs and gene-drive research for population suppression. Annual NA economic losses to spotted-wing drosophila are estimated in the HUNDREDS OF MILLIONS OF DOLLARS even with intensive control. The species is the foundational case study in modern textbook discussions of newly-emerging invasive pest insects.

5 wild facts on file

Engineer

Females have SERRATED OVIPOSITOR with saw-like teeth along the edges that pierces INTACT FIRM FRUIT SKINS and lays eggs INSIDE firm, ripe, intact fruit — primary pest of marketable fruit rather than secondary pest of damaged fruit.

AgencyUSDA Agricultural Research ServiceShare →

Navigator

First detected outside East Asian native range in California in 2008 — has spread rapidly across NA, Europe (since 2008), South America (since 2013), and Africa (since 2014).

AgencyUSDA APHISShare →

Agricultural

Major pest of SOFT FRUITS — cherries, strawberries, raspberries, blackberries, blueberries, grapes. Annual NA economic losses estimated in HUNDREDS OF MILLIONS OF DOLLARS.

AgencyUSDA Agricultural Research ServiceShare →

Deceptive

Unlike the related vinegar fly Drosophila melanogaster (which feeds on overripe and rotting fruit), spotted-wing drosophila attacks FIRM, RIPE, INTACT FRUIT — primary pest behavior, not secondary pest behavior.

AgencyUSDA Agricultural Research ServiceShare →

Smart

Focus of major USDA control programs since 2008 — bait sprays, cultural management, pheromone trapping, Sterile Insect Technique, and (most recently) GENE-DRIVE research for population suppression.

AgencyUSDA Agricultural Research ServiceShare →

Cultural file

The spotted-wing drosophila is one of the most economically destructive newly-emerging invasive insect pests of the past two decades and the foundational case study in modern textbook discussions of newly-emerging invasive pests. The species is featured in essentially every modern fruit pest management curriculum.