Answer: The biggest threat to new seedlings is damping off, which is caused by a soil-borne fungus. Since you are using a sterile mix, you shouldn't have a problem. (If you have had problems with damping off in the past, be sure to sterilize the pots before planting.) I always avoid using fungicides and insecticides unless I am sure I have a problem; by spraying a little every day you encourage pests to build up resistance to the chemical. I would only spray a fungicide if you see definite symptoms of a fungal infection.
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