Tex. Agriculture Code § 76.002: PESTS.

The department shall determine what organisms constitute pests for purposes of this chapter and may include in the list of pests:

(1) any insect, snail, slug, rodent, bird, nematode, fungus, weed, or other form of terrestrial or aquatic plant or animal life; or

(2) any virus, bacteria, or other microorganism, other than a virus, bacteria, or other microorganism on or in living man or other living animals.

Acts 1981, 67th Leg., p. 1190, ch. 388, Sec. 1, eff. Sept. 1, 1981. Amended by Acts 1997, 75th Leg., ch. 1369, Sec. 1, eff. Sept. 1, 1997.