Key Features
- Pinkish -straw colored leaves
- Symptomatic leaves attached to stem
- Black pustules on dead leaves
Symptoms
Macrophoma causes leaf spots, and result in pinkish- straw colored leaves. Leaves remain attached to the plant, but develop numerous black pustules.
Biology
This pathogen invades leaves damaged by cold, wind or bad pruning practices, and spreads from there.
Management Recommendations
Prune out the affected portion of the plant, and protect boxwood against stress. Because the primary problem is stress or damage, no fungicides are effective or labeled at this time, and preventing winter injury is the best way to manage this disease.
Effective Pesticides
Pesticides are neither available nor recommended for managing this disease.
Resources
- Not satisfied with ID? Contact the Purdue Plant and Pest Diagnostic Lab
- Sign Up for the Purdue Landscape Report
