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Grape

Identifying Pests and Abiotic Disorders

On this page
  • Bot canker
  • Eutypa dieback
  • Leafroll virus
  • Measles
  • Phylloxera
  • Pierce's disease
  • Nematodes
  • Phomopsis cane and leaf spot

If your vineyard has a history of these pests or disoders, use the photos below to identify symptoms in your vines. Names link to more information on identification and management.

Click on photos to enlarge

Bot canker
Bot canker
Identification tip: Bot canker causes death of arms, cordons, and vines. The wedge-shaped, darkened cankers that develop in the woody vascular tissue are indistinguishable from Eutypa dieback. Unlike Eutypa dieback, there are no foliar symptoms.

Eutypa dieback
Eutypa dieback
Identification tip: Symptoms in the wood are characterized by darkened cankers that develop in the vascular tissue.

Leafroll virus
Leafroll virus
Identification tip: Leaves with leafroll virus symptoms are cholorotic with rolled edges. Leaves of red fruit varieties have reddened leaf tissue.

Measles
Measles
Identification tip: On berries, small, round, dark spots, each bordered by a brown-purple ring, may occur.

Phylloxera
Phylloxera
Identification tip: Damaged vines in field showing dead, dried up branches and foliage due to root feeding by phylloxera.

Pierce's disease
Pierce’s disease
Identification tip: Advanced late-summer or fall symptoms of Pierce's disease on foliage of a white grape variety shows concentric rings of drying from the outer edge toward the center.

Nematodes
Nematodes
Identification tip: Nematode infestations result in areas of the vineyard with vines that lack vigor and have restricted growth and reduced yields.

Phomopsis cane and leaf spot
Phomopsis cane and leaf spot
Identification tip: Primary infections of Phomopsis show up as small spots on basal portion of shoots.
 

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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