what causes yellow spots on roses
Save. Yellow leaves and brown spots on roses may be caused by pests, nutrient deficiency, environmental factors and diseases. Yellowing leaves may also be caused by excess water. Brown and black spots may be caused by fungus.Too much rain, irrigation or poor drainage can lead to yellow leaves.There are multiple reasons for yellow leaves and brown spots on roses, and treatment must be started after properly diagnosing the cause of the problem.rown and black spots may be caused by fungus. Too much rain, irrigation or poor drainage can lead to yellow leaves. There are multiple reasons for yellow leaves and brown spots on roses, and treatment must be started after properly diagnosing the cause of the problem.