A list of 10 steps (with detailed explanations) to successful greenhouse propagation (by reducing risk of diseases and pests). [PDF] Ten Basic Steps to Less Disease in Your Crop By: Dr. Steve Nameth Department of Plant Pathology The Ohio State University "Quick Reference Table: Ten Steps to Disease-Free Growing 1. Always start with disease-free seed, cuttings, and propagation material. 2. Grow disease resistant crops, if possible.(...too late for that!) 3. Quarantine incoming plant material. 4. Practice good sanitation techniques. 5. Monitor and suppress insect and mite populations. 6. Modify the environment to suppress disease. 7. Avoid plant stress. 8. Monitor the crop on a daily basis. 9. Keep unauthorized personnel traffic to a minimum. 10. Use pesticides as a last resort."