WSU Extension


Botrytis bunch rot (Gray mold) 
Powdery mildew 
Brown marmorated stink bug 
Cutworms and armyworms 
Grape erineum mite 
Spider mites 
Spotted wing Drosophila (SWD) 

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Caption: Grape erineum mite damage
Photo by: A.L. Antonelli
Grape : Grape erineum mite
(revision date: 6/8/2015)

The grape erineum mite, Collomerus vitus, is actually a type of eriophyid mite. They are very tiny, whitish, worm-like, and spindle-shaped. Their bodies have definite annulations or rings, and only two pairs of legs directly behind the mouthparts. They overwinter under outer bud scales and feed on leaves during summer. The upper leaf surface becomes blistered, and blisters on the lower leaf surface turn white, yellow, or brown. Colonies of mites live inside the blisters (erinea) formed by their feeding on the lower surfaces. The blisters contain masses of enlarged leaf hairs. Large infestations can cause major stress on young vines. From mid-August to leaf drop, the mites migrate back to the overwintering sites beneath bud scales.
Management Options

Non-Chemical Management
  • None are known to be effective.
Select non-chemical management options as your first choice!

Chemical Management

Apply according to label instructions. Dormant-season horticultural oils or wettable sulfur applications may be helpful. Directed controls specifically for erineum mite are usually not necessary.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • All Seasons Horticultural & Dormant Spray Oil Conc [Organic]
    Active ingredient: oil/pet distillate  |  EPA reg no: 4-80
  • Defend DF/Home & Garden Use/for Organic Gardening [Organic]
    Active ingredient: sulfur  |  EPA reg no: 62562-8
  • R-T-U Year-Round Spray Oil
    Active ingredient: oil/pet distillate  |  EPA reg no: 6218-78
  • This list may not include all products registered for this use.

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Caption: Grape erineum mite damage
Photo by: A.L. Antonelli
Caption: Grape erineum mite damage
Photo by: B.M. Johnson