How to Manage Pests
UC Pest Management Guidelines
Artichoke
Verticillium
Wilt
Pathogen: Verticillium dahliae
(Reviewed 1/07,
updated 1/07)
In this Guideline:
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Symptoms of Verticillium wilt include wilting, chlorosis, and stunting of
plants. Leaves often have a marginal necrosis. Vascular discoloration, which is
characteristic of this disease on other hosts, may not be always present in
artichoke plants. Diseased plants produce smaller buds, and in severe cases,
buds become discolored and dried, and the plant collapses. Roots exhibit the characteristic
vascular discoloration of this disease.
Infected artichoke plants may not exhibit any symptoms of disease. It is
possible that only stressed plants will show indications of infection by this
pathogen. In severe cases, yields can be reduced by as much as 50%. Verticillium
dahliae produces microsclerotia that can
survive for many years in the soil without host plants present.
Practice proper cultural practices in order to avoid stressing
plants. Do not take crowns to be used for propagation from fields where the
disease has occurred. Do not plant annual artichokes in fields with a history
of V. dahliae. Rotate Verticillium-infected fields into broccoli. All annual artichoke
varieties have been found to be more susceptible to V. dahliae than the perennial Green Globe variety.
UC IPM Pest Management Guidelines: Artichoke
UC ANR Publication 3434
Diseases
S. T. Koike, UC Cooperative Extension, Monterey County
Acknowledgment for contributions to the disease section:
S. Colbert, Griffin Corp., Valdosta, GA
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