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Fruit Rot and Cane Botrytis

Botrytis cinerea

14 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Gray mold develops on raspberry fruit at harvest, and you see watermark lesions on canes in late summer. Botrytis cinerea drives wet-weather losses exceeding 50% during bloom and harvest. Manage by improving canopy air circulation, pruning to reduce density, minimizing nitrogen, and harvesting in cool morning hours. Select resistant cultivars like Munger or Meeker.

No single cultural practice provides adequate management of gray mold under highly conducive conditions. Integrate several tactics to manage this disease.

Quick Reference

Causal Agent
Botrytis cinerea
Host Plants
14

Management

Cultural Controls

  • No single cultural practice provides adequate management of gray mold under highly conducive conditions.
  • Integrate several tactics to manage this disease.
  • The use of cultural tactics reduces reliance on fungicide applications and can help manage fungicide resistance. 'Munger', 'Chilliwack', 'Comox', 'Fairview', and 'Meeker' have shown moderate resistance to Botrytis fruit rot.
  • Create an open plant canopy: use a double top wire training system, prune, avoid excessive nitrogen fertilization, and control weeds.
  • These practices improve air circulation, increase light penetration, and speed drying of plant surfaces after irrigation and rain.
  • Avoid excessive nitrogen fertilization.

Host Plants (14)