Common Rose Ailments

In caring for roses, it’s important to know that treatments are available for some of the most common pests and diseases.


Aphids, also known as plant lice, greenflies, blackflies, or whiteflies are small sap-sucking insects, and are members of the superfamily Aphidoidea. Aphids are among the most destructive insect pests on cultivated plants.

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Aphid photo courtesy of Gyorgy Csoka, Hungary Forest Research Institute,

Black Spot

Black spot is a common rose disease (Diplocarpon rosae). This fungal disease forms black spots all over the foliage of rose bushes. If left unchecked, it can cause a rose bush to totally defoliate.

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Black spot photo courtesy of Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services,


Rusts are plant diseases caused by pathogenic fungi of the order Pucciniales. Unlike other plant pathogens, rust usually affects healthy and vigorously growing plants.

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Rust photo courtesy of Lesley Ingram,

Powdery Mildew

Powdery mildew is a fungal disease affecting a wide range of plants. These diseases are caused by many different species of fungi in the order Erysiphales. Infected plants display white powdery spots on the leaves and stems.

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Powdery mildew photo courtesy of Clemson University – USDA Cooperative Extension Slide Series,


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Being a leader in the tree care industry means continually focusing on learning and innovation. Bartlett’s Tree Topics blog follows in that tradition by offering a place to receive advice on trees, tree pests, tree preservation, and more.

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