Synergism of Two Benzoylphenyl Urea Insect Growth Regulators

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Abstract
An omnivorous leafroller, Platynota stultana Walsingham, and the beet armyworm, Spodoptera exigua (Hübner), are respectively tolerant and susceptible to the benzoylphenyl ureas diflubenzuron and Bay Sir 8514 (2-chloro-N-(((4-(trifluoromethoxy)phenyl)amino)carbonyl)benzamide). LC50 values for diflubenzuron and Bay Sir 8514 in artificial diet for 1st in stars were, respectively, 6938 and 173 ppm with P. stultana and 1.10 and 8.06 ppm with S. exigua. DEF® (S,S,S-tributylphosphorotrithioate), an esterase inhibitor, synergized diflubenzuron and Bay Sir 8514 3,319- and 45-fold, respectively, in P. stultana, but was not synergistic in S. exigua. Piperonyl butoxide, an oxidase inhibitor, did not synergize either benzoylphenyl urea in either insect.