AMSEED American Seed Intelligence Platform

Phytophthora Blight

Phytophthora capsici · oomycete · also: pepper root rot

Issue type
disease
Seedborne
No
Resistance code
Pc
Affects
Pepper, Watermelon, Cucumber, Melon

Symptoms

Sudden permanent wilt with a dark water-soaked lesion girdling the stem at the soil line, often taking whole rows within days of a heavy rain. On fruit it appears as a white, yeast-like growth.

Management

A water disease before it is a plant disease: raised beds, ruthless drainage, and never irrigating from a pond that drains an infested field. Resistant bell varieties carrying Pc resistance changed commercial production where the pathogen is established, though resistance is partial and physiological races differ.

Varieties with documented resistance

VarietyLevelCodeDaysBreeding
Paladin resistant Pc 70-78 F1 hybrid
Revolution intermediate Pc 72-78 F1 hybrid
Declaration intermediate Pc 70-78 F1 hybrid

Sources & References

Evidence: 2 sources, all independent references.

  1. Pepper Production Guides · University of Florida IFAS Extension, University or Government
  2. Chile Pepper Institute research and variety releases · New Mexico State University, University or Government