Answer: Fortunately, it sounds as though your seedlings are not suffering from "damping off" Damping off is a disease caused by a fungus which attacks the stem of the seedling causing the seedling to fall over and eventually die. I'm not quite sure what the spiderweb-like substance is on the tops of the peat pots. If the seedling looks healthy and grows normally, I would ignore the web-like substance. If they don't grow normally, then you may have spiders or spider mites (you'll need a magnifying glass to see these little fellas on the undersides of the leaves!) You might try removing the covers for a short time each day to increase air circulation.
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