Indiana Code Title 15. Agriculture and Animals § 15-16-4-2

(1) in the case of a pesticide other than a plant regulator, defoliant, or desiccant, an ingredient that will:

insects, nematodes, fungi, rodents, weeds, or other pests;

(2) in the case of a plant regulator, an ingredient that, through physiological action, will accelerate or retard the rate of growth or rate of maturation or alter the behavior of:

(3) in the case of a defoliant, an ingredient that will cause the leaves or foliage to drop from a plant;

(4) in the case of a desiccant, an ingredient that will artificially accelerate the drying of plant tissue; and

(5) in the case of a nitrogen stabilizer, an ingredient that will prevent or hinder the process of nitrification, denitrification, ammonia volatilization, or urease production through an action affecting soil bacteria.