Abstract: A method of increasing protein expression encoded by a foreign gene in plants which comprises treating a locus comprising the plant or the seed from which it grows with aldicarb. A method of controlling pests at a locus, which locus comprises a plant containing a gene which encodes for Bt endotoxin, the method comprising the application of aldicarb at the plant or at the seed from which it grows. A method of controlling weeds at a locus, which locus comprises a plant containing a foreign gene which encodes a protein imparting tolerance to an herbicide, wherein the herbicide is applied in locus to plant, the method comprising the application of aldicarb to the plant or to the seed from which it grows. A method of increasing the time during which an herbicide may be applied to an herbicide tolerant plant, which method comprises applying a systemic pesticide to the plant or to a seed from which it grows.