Pacific Northwest 1998 An Online Guide to Plant Disease Control

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OSU Extension Office
 
Pepper (Capsicum annuum) -- Verticillium Wilt
 
Cause: Verticillium dahliae and V. albo-atrum. These fungi are widespread soil inhabitants that affect a wide range of herbaceous and woody plants. They enter through the root system and progress primarily through the vascular system.
Symptoms: Infected plants' growth is stunted and leaves, beginning with lower leaves, yellow and roll in. If the stem is cut open in cross-section, the vascular system is distinctly discolored at the soil line.
Cultural control:

  1. Do not leave crop remains on the field or add them to the compost pile, because this encourages future infections.
  2. Rotating to nonsusceptible grass or grain crops may help a little.
  3. Avoid tomato and potato in rotations. They are very susceptible hosts.
Chemical control: Soil fumigation is recommended in the Hermiston, OR area.

  1. Metam sodium (Vapam HL) at various rates. See label.
Content edited by: Cynthia M. Ocamb on January 1, 2009
 
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