New species eating your plants - Tecoma eater is Antigastra catalaunalis
We have a species identification on the larva that has been defoliating tecomas, like yellow bells and orange jubilee. Always select least toxic measures to manage any pest problem. Since this is a new problem in AZ, we haven't had a lot of experience controlling it. We don't know how persistent they will be. It is possible that the first frost of winter will knock them back and we won't see them again. We are encouraging our clients to adopt a "wait and see" attitude, if possible. If it is necessary to use chemical controls, I recommend a Bt (Bacillus thuringiensis) product. Use at the maximum labeled rate. The caterpillar's habit of covering itself in leaf material means contact insecticides will probably not work.