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Marigolds have few pests or problems overall, but spider mites and aphids sometimes infest the plants. Usually a spray of water or the application of an insecticidal soap, repeated every other day for a week or two, will solve the problem. Occasionally, marigolds will be affected by fungal diseases such as powdery mildew if conditions are too wet. To prevent fungal issues, avoid getting water on the marigolds’ leaves, keep weeds down, and plant in well-drained soil.