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Zinnias are colorful, low-maintenance annuals that prefer warm weather and bright sunlight. Although zinnias are relatively disease-resistant, they are sometimes plagued by diseases that cause brown spots. The brown spots are usually caused by one of three types of leaf spot -- Alternaria leaf spot, bacterial leaf spot and Cercospora leaf spot.
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.