University of Maryland Extension

Macrophoma Leaf Spot

Return to Diseases of Shrubs

Macrophoma infected leaf
Black, raised fruiting body of Macrophoma on boxwood leaf

Most boxwoods are susceptible to infection by the weakly parasitic fungus, Macrophoma candollei. The most obvious symptoms are the many tiny black raised fruiting bodies found on dying or dead straw-colored leaves.

In home landscapes proper pruning and thinning, instead of shearing the shrubs, is the most effective way to manage this disease. This helps to increase air circulation helping the leaves to dry out and not stay constantly moist. 

Additional Resource

Video: How to Prune your Boxwood

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