What's eating my concord grape?

Concord grape faces serious pressure from Japanese beetles, grape berry moth, and birds. Its slip-skin berries and foxy aroma attract both insect and avian pests. Japanese beetle skeletonization of leaves and grape berry moth larvae tunneling into berries are the primary yield threats; bird netting is essential at veraison.

Skeletonized leaves where only veins remain; severe defoliation weakens vines and reduces next year's bud hardiness; adults aggregate in clusters Hand-pick beetles in the morning when sluggish; apply neem oil as a feeding deterrent; do not use pheromone traps near the vine as they attract more beetles than they catch

First generation larvae web and kill flower clusters; second and third generations bore into berries, leaving entry holes and causing bunch rot Use degree-day models or pheromone traps to time sprays; apply spinosad at first egg hatch; remove bark strips where pupae overwinter

Berries are eaten or knocked off in clusters as they ripen; entire bunches can be stripped within days of veraison Drape fine-mesh bird netting over the canopy at veraison; flash tape and scare devices offer limited long-term deterrence

White stippling on upper leaf surface caused by nymphs and adults feeding on undersides; heavy infestations cause early leaf drop Encourage natural enemies (parasitic wasps); insecticidal soap or pyrethrin for severe outbreaks; remove weedy groundcovers that harbor overwintering adults