How to treat black spot on your roses - It’s among the most common rose problems – but there are ways to control it.

which eventually turn yellow and drop off. In humid conditions, black spot disease proliferates rapidly, significantly weakening roses and stunting their growth. While black spot won't kill roses ...

Gardeners should be aware that the humid weather in May can spread diseases like rose rust, which can damage plants if not ...

In May, rust typically starts to spread, so it's advisable to regularly check your roses, particularly the lower leaves where it's commonly found. Rust manifests as orange or yellow spots on ...

The spotted yellow leaves are the result of black spot disease. Knock Out roses, in general, are quite resistant (not immune) to black spot disease. During wet weather conditions, however, even ...

Round black spots then appear on the rose leaves before they turn yellow and drop off ... fall victim to black spot disease. He said: "A spray composed of one part milk and two parts water ...