There are many potato diseases and pests that can affect your crops. Some of them include potato blight, potato scabs, aphids, and potato beetles. The best way to prevent these issues is to use multiple modes of attack with your pesticides and fungicides. Rotating crops, practicing good sanitation, and choosing disease-resistant varieties can help reduce insect and disease pressure. Fungi-Phite, used in injunction with your labeled fungicides can also improve efficacy.