Horseradish (Armoracia rusticana)-Verticillium Wilt

Latest revision: 
March 2024

Cause Verticillium dahliae or V. longisporum, fungi that can survive as resistant mycelium in soil for many months to years.

Symptoms Unilateral wilting and death of aboveground plant portions. Sometimes, interveinal yellowing of lower leaves and plant stunting precede or accompany wilt. The root's vascular tissue becomes brown or black, reducing the grade of the product when harvested.

Cultural control Long rotation is the only control available.

Biological control

  • Bexfond at 7 to 14 fl oz/A. O
  • Stargus at 6 to 8 fl oz per 1,000 ft row as an in-furrow treatment, 3 to 4 quarts/A as a soil drench on 10- to 14-day intervals, or 3 to 4 quarts/A as a chemigation drip treatment on 14- to 21-day intervals. Preharvest interval is 0 days. 4-hr reentry. O