University of Florida

Controlling Leaf Spot on Roses

Many Floridians choose not to grow roses because our warm, humid climate makes roses especially susceptible to black spot and cercospora leaf spot.

Like their names suggest, these fungal diseases show up as dark spots on leaves and stems. They can also cause a plant to drop its leaves and eventually die.

Protect hybrid tea roses with a fungicide spray every week or two. You'll need to switch chemicals every few sprayings to keep the fungi from becoming immune. Make sure the roses get plenty of air circulation and avoid using overhead irrigation to prevent the pathogens from spreading.

There are many antique roses and new shrub-type varieties that have greater resistance to fungal diseases. Look for these types when shopping for new roses.


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