Some Parameters of Benzoylphenyl Urea Toxicity to Beet Army worms (Lepidoptera: Noctuidae)

1 June 1983

journal article
Published by Oxford University Press (OUP) in Journal of Economic Entomology

Vol. 76 (3) , 399-402
https://doi.org/10.1093/jee/76.3.399

Abstract

Five benzoylphenyl urea insect growth regulators, diflubenzuron, penfluron (2,6-difluoro-N-[[[4-[trifluoromethoxy]phenyl]amino]carbonyl]benzamide)BAY SIR 8514 (2-chloro-N-[[[4-[trifluoromethoxyl]phenyl]amino]carbonyl]benzamide), EL 1215 (2,6-dimethoxy-N-[5[4[pentatluoroethoxy]phenyl]1,3,4-thiadiazo1-2yl] benzamide), and UC 62644 (2,6-difluoro-N-[[[4-[3-chloro-5-trifluoromethy1-2-pyridiny1-oxy]-3,5-dichlorophenyl]amino]carbonyl]benzamide) were tested against Spodoptera exigua (Hübner) in laboratory bioassays. The order of LC₅₀ values was UC 62644 > penfluron > EL 1215 > diflubenzuron > BAY SIR 8514 with a 35 ✕ difference between the most and least toxic chemicals. Small differences in toxicity were observe between WP and T formulations. Treatments at the first 2 in stars and the 4th-instar indicated that these age classes were nearly equally susceptible. Diflubenzuron, penfluron, and BAY SIR 8514 were tested in 4th-instar topical biossays. Penfluron showed the highest toxicity in the topical bioassays.

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