Common strawberry pests include slugs, snails, aphids, and spider mites. You can use organic methods such as handpicking, trapping, or spraying with insecticidal soap to control these pests. Common diseases affecting strawberries include powdery mildew, gray mold, and verticillium wilt. To prevent these diseases, you should avoid planting strawberries in areas where they have previously been grown and practice good sanitation by removing and destroying any infected plants or debris.