Aluminum isopropoxide (CAS Reg. No. 555-31-7) and aluminum secondary butoxide (CAS Reg. No. 2269-22-9) are exempted from the requirement of a tolerance when used in accordance with good agricultural practices as stabilizers in formulations of the insecticide amitraz [N′-(2,4-dimethylphenyl)-N-[[(2,4-dimethylphenyl)imino]-N-methylmethanimidamide] applied to growing crops or animals.