My Tithonia seedling are out now day and night to harden them off. They have been out about a week. I have plastic trays with a variety of annuals in the larger peat pots but something in the yard really likes the Tithonia as its the only thing being eaten

Sometime they eat the top leaves and all thats left is a stalk. Sometimes they eat the leaves one at a time until only the stem remains.

I don't think I can figure out what bug it is but what can I put on them that will deter the bug.

There are probably 7 or 8 different types of annual flowers in the tray and they are crazy about only the Tithonia