How to Manage Pests

Pests in Gardens and Landscapes

Verticillium wilt—Verticillium spp.

 

Verticillium wilt is a fungal disease that affects the plant's vascular system. It causes the foliage to turn faded green, yellow, or brown, and sometimes wilt in scattered portions of the canopy or on scattered branches. Shoots and branches wilt and die, often beginning on one side of the plant, and occasionally entire plants die. Peeling back the bark on newly infected branches may reveal dark stains following the grain on infected wood. Many trees are affected, but common hosts include ash, camphor, Chinese pistache, fuchsia, hebe, maple, olive, pepper tree, pistachio, and rose. A few hosts such as olive exhibit little or no vascular discoloration; this discoloration is a common field diagnosis symptom for most other woody plants infected by Verticillium wilt.

Solutions

Keep plants vigorous by providing trees with proper irrigation, fertilizer, and other appropriate care to promote new growth and increase their chance for survival. Chronic branch dieback may develop in surviving trees; prune out any dead wood. Regularly inspect for possible hazards; affected trees may need to be removed. Where Verticillium wilt has been a problem, plant only resistant species. Soil solarization before planting may be effective.

 

Brown, dead foliage of Verticillium wiltBrown, dead foliage of Verticillium wilt

Damage to vascular tissue
Damage to vascular tissue


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