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Grape (Table)

Other Pests You May See—Delayed-Dormant Period

On this page
  • Pocket gophers
  • California ground squirrel
  • Voles
  • Rabbits
  • Grape bud beetle
  • Click beetle
  • Branch and twig borer
  • Eutypa dieback
  • Bot canker

Look for burrows, mounds, tunnels, runways, or fresh droppings that indicate the presence of rabbits, squirrels, pocket gophers, and voles. Also look for branch and twig borer and the damage it causes on vines and buds. Darkened cankers may indicate the disease, Eutypa.

Names link to more information on identification and biology or management.

Click on photos to enlarge

Rodents and rabbits

Pocket gopher mound
Pocket gophers
Identification tip: Pocket gophers leave characteristic crescent-shaped mounds from the holes they dig.

Damage from squirrels
California ground squirrel
Identification tip: Beside gnawing vines and shoots, ground squirrels dig burrows that damage root systems.

Girdling of grapevine, damage from voles.
Voles
(meadow mice)
Identification tip: Girdling of grapevine indicates vole activity.

Rabbits damage grapevines by eating through bark
Rabbits
Identification tip
: Rabbits damage or kill grapevines by eating through the bark to the cambium layer. They also chew and gnaw on plastic irrigation lines.

Beetles

Grape bud beetle
Grape bud beetle
Identification tip: Adults are a light gray color and about 0.25 to 0.4 inch long. Grape bud beetles are colored a fluorescent silvery blue when exposed to ultraviolet (UV) light.

Click beettle
Click beetle
Identification tip: Adults are about 0.4 inch long, reddish brown to black, with a prothorax that has pointed posterior tips.

Branch and twig borer damage
Branch and twig borer
Identification tip: Frass-filled holes at old pruning scars indicate activity by branch and twig borer.

Diseases

Eutypa dieback
Eutypa dieback
Identification tip: During late dormant season pruning, characteristic wedge-shape cankers can be seen in the cross sections of pruned vines infected with Eutypa.

Canker caused by Eutypa
Identification tip: Cut away bark from a canker (adjacent to a pruning wound) and look for dead brown wood underneath.

Bot canker
Bot canker
Identification tip: Wedge-shaped, darkened cankers develop in woody vascular tissue.

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