The responses of over 2600 tobacco budworm male moths collected in Louisiana from May through September 1987 to a discriminating dose (10 µg/vial) of cypermethrin indicated that the pyrethroid resistance management plan adopted and recommended by Arkansas, Louisiana and Mississippi was successful in helping reduce resistant genotypes. During August and September 1986, survival of male moths in vials dosed with 10 µg of cypermethrin was 33-37%. During 1987, survival at the same dose was 20, 13, 18, 12 and 15% for males collected during May, June, July, August and September, respectively. The frequency of pyrethroid resistant genotypes was generally higher in the northern part of the cotton production areas than in the southern part. Dosage mortality data (LC(50) 's and LC(90)'s) on selected populations of tobacco budworm confirmed the results obtained using the discriminating dose.