Field Identification
A flightless weevil whose whitish larvae chew fine roots and crowns of strawberry, brambles, and some ornamentals, while adults notch leaf edges at night. Plants decline in patches, wilt in heat, and produce small fruit before collapsing—symptoms mimic root rot until you find crescent feeding on leaves. Common in temperate berry regions of North America—roughly zones 4–9—and in similar climates in the Andes and Mexican highlands where strawberries are grown on plasticulture or matted rows.
Adults are dark, about 1/4 inch (6 mm), with elbowed antennae and fused wing covers—no flight. Feeding notches have smooth edges; look with a flashlight after dusk. Larvae are legless, C-shaped, cream-colored grubs in soil and crown tissue. Field ID pairs leaf notching with poor row vigor in irregular patches.
How to Deal With It
Organic Control Methods
Entomopathogenic nematodes (Steinernema spp. and Heterorhabditis spp.) applied as drench or through drip when soil temperature and moisture match product labels can kill larvae in root zones. Repeat applications are often needed in sandy, fast-draining beds.
Ground beetles, ants, and birds consume adults and some larvae; fungal pathogens occasionally suppress weevils in moist soils. Keep flowering groundcovers in drive rows to support generalist predators without letting tall weeds shade berries.
Rotate strawberry fields to new ground on a planned cycle; avoid bringing infested soil on tools. Clean plasticulture between seasons; solarize shallow beds where feasible. Flame or mow old foliage after renovation to reduce adult cover, timing to avoid crown damage.
Shake night-feeding adults from canopy edges into soapy trays—feasible on small farms. Fine mesh fencing buried a few inches may slow walking adults entering clean blocks; combine with nematodes because fencing alone rarely stops established populations.
Scout leaf notching weekly after fruit set; sticky bands on legs or posts catch some walkers. Flag weak patches for nematode passes before renovation. Inspect nursery plugs for notched leaves at planting.
Let Nature Handle It
Natural Enemies
- Entomopathogenic Nematodes
- Ground Beetles (Carabidae)
- Ants (Formicidae)
- Insectivorous Birds
Threat Map