How to raise a healthy tomato (tamatar) nursery and when to transplant?

A healthy nursery is the foundation of a good tomato crop and the best place to prevent leaf curl virus and damping off. Raise seedlings on raised beds or in pro trays with sterile media, ideally under a 40 mesh insect proof net to keep out whiteflies that carry leaf curl. Treat seed with a fungicide like thiram, sow thinly, and avoid overwatering to prevent damping off. Harden seedlings before moving them out. Transplant healthy, stocky seedlings at about 25 to 30 days or 4 to 5 true leaves, in the evening, with proper spacing for airflow. Dip roots in a recommended fungicide or biocontrol solution at transplant. Starting clean and protected in the nursery greatly cuts disease and spray costs in the field.