How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Pierce's disease

Pierce's disease is usually evident by the scorching and reddening of leaves. Symptoms of several other disorders of grapes can be confused with Pierce's disease. Any disorder that weakens or causes deterioration in vine growth in late summer or fall may lead to delayed or stunted growth the following spring. Eutypa dieback symptoms in spring include stunted shoots and small, chlorotic, distorted leaves, which resemble those of Pierce's disease. Pruning wound cankers, however, are not associated with Pierce's disease as they are with Eutypa dieback. Phylloxera causes a decline of vines; look for phylloxera insects on roots. Oak root fungus can cause wilting, along with discoloration and drying of fruit and foliage, but fungal fans will be evident beneath bark in crown area.

Eutypa dieback
Eutypa dieback
Oak root fungus
Oak root fungus
Pierce's disease
Pierce's disease
Phylloxera damage
Phylloxera damage

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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