Robbins, W.E., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Thompson, M.J., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Svoboda, J.A., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Shortino, T.J., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Cohen, C.F., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Dutky, S.R., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States
Duncan III, O.J., Insect Physiology Laboratory, Beltsville, 20705, Maryland, United States

Several new branched and straight chain secondary and tertiary amines were shown to have inhibitive effects upon development and metamorphosis and the Δ24-sterol reductase system in larvae of the tobacco hornworm similar to those previously observed with a number of azasteroids. Certain of the amines which are related structurally to compounds with juvenile hormone activity in insects also blocked development and metamorphosis in three other species of insects. These compounds are lethal or inhibit development in all larval stages and thus differ in action from compounds with juvenile hormone activity where the principal effect is to block the penultimate or ultimate molt. © 1975 American Oil Chemists' Society.