Walnut

Other Pests You May See—Budbreak through Bloom

On this page
  • Phytophthora root and crown rot cankers
  • Ground squirrels burrows
  • Tree squirrel adult
  • Pocket gopher mounds
  • Tree squirrel damage

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

Click on photos to enlarge

Phytophthora root and crown rot
Phytophthora root and crown rot cankers
Identification tip: To confirm the presence of Phytophthora crown rot, cut away the outer bark and look for a canker that has water-soaked margins and extends through the inner bark and cambium.

Pocket gopher mound
Pocket gopher mounds
Identification tip: Pocket gopher mounds are generally fan shaped and have a plugged opening.

Ground squirrels burrows
Ground squirrel burrows
Identification tip: The burrow openings are about 4 inches in diameter, but can vary considerably.

Tree squirrel damage
Tree squirrel damage
Identification tip: Look for bark chewed off of scaffolds.

California ground squirrel.
Ground squirrel adult
Identification tip: The adult head and body ranges from 9 to 11 inches long and itís somewhat bushy tail is about as long as its body. The fur is mottled dark and light brown or gray.

Tree Squirrel
Tree squirrel adult
Identification tip: Tree squirrel adults can be distinguished from ground squirrels and chipmunks by their long bushy tails and lack of flecklike spots or stripes. When frightened they will escape up trees ra-ther than down burrows.


Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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