How to Manage Pests
Pests in Gardens and Landscapes
Grape bud beetle—Glyptoscelis squamulata
Adult grape bud beetles are about 6 to 10 mm long and 5 to 6 mm wide. Young adults are normally covered
with light gray scales. Older adults assume a dark brown color where scales have been removed and a light
gray color where scales are still present. Larvae are whitish gray with the last larval stage slightly
larger than adults.
Adult beetles cause fruit loss by feeding on opening buds and eating the bud center, which contains
immature leaves and flower cluster primordia.
Hand pick beetles off vines and prune off damaged shoots. When shoots are 1 to 1.5 inches long, feeding
damage is negligible and beetles no longer need to be controlled.
bud beetle adult and eggs
center eaten by adult beetle