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Marigolds are generally resistant to pests and issues, though they can occasionally attract spider mites and aphids. A simple solution is to spray the plants with water or use insecticidal soap, applying it every other day for a week or two to eliminate the pests. Additionally, marigolds may face fungal diseases like powdery mildew in overly damp conditions. To prevent these fungal problems, it’s best to avoid wetting the leaves, manage weed growth, and ensure they are planted in well-drained soil.