First of all, with a DBA, your personal assests such as home, auto, etc are protected. The state of Texas will not allow these to be taken.
Secondly, if you do business in Texas, you had better be aware of TCEQ. The Texas Comission on Environmental Quality . This group is responsible for all the enforcement for irrigation, soil and chemical issues.
Yes, TDA enforces as well, but only where TDA has the sole interest.
TCEQ has the right to demand to see licenses, check records and check calibration on spray equipment.
Also, for those of you doing business in Texas, if you do not have a spray license from TDA, and even carry material in your truck, you will need a much more restrictive license from TSPCB - Texas Structural Pest Control Board.
Also be aware, these agencies have an intense networking/communication built in wherein if a complaint is made to one agency that they can't handle, they pass it around.