Glad you noted that only for ornamental plants since I think it's fair to say that most of us don't consider tomato plants or most other garden veggie plants we grow as ornamental plants.
Here's what EXTOXNET has to say about Daconil.
Note just one place makes Daconil and then it is distributed to Bonide and others that sell it commercially.
http://extoxnet.orst.edu/pips/chloroth.htm
If I were to go to the Cornell database for info about Daconil and other products used on commercial fields as well as home gardeners I'd get even more nfo.
Imp,that place that manufactures ALL chlorothalinol is in TX, you are in TX,so why don't you call them,they list their phone number and see what they have to say,especially about tomatoes.
Carolyn