Evaluation of Diflubenzuron for Mexican Bean Beetle (Coleoptera: Coccinellidae) Control and Impact on Pediobius foveolalus (Hymenoptera: Eulophidae)1

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Abstract
Laboratory and field studies were conducted to determine the effect of diflubenzuron on the Mexican bean beetle (MBB), Epilachna varivestis Mulsant, and a larval parasite, Pediobius foveolatus (Crawford). Laboratory tests showed that the compound, at concentrations of 0.01, 0.10, and 1.00% AI, had no significant effect on parasite oviposition, fecundity, emergence rate, or developmental time when topically applied to either adult pamsites before oviposition or parasitized MBB larvae 10 days after oviposition (P ≤ 0.01). Profound interference of parasite development does occur when diflubenzuron is applied to MBB larvae just before parasite oviposition or to MBB larvae 4 days after parasite oviposition (P ≤0.01). In the field study, three rates of diflubenzuron at 0.018, 0.053, and 0.088 kg of AI/ha were tested along with carbaryl at 1.12 kg of AI/ha; a control also was included. Diflubenzuron gave ca. 70% control of the MBB, and carbaryl gave ca. 83% control. Parasite emergence was not significantly different (P ≤ 0.01) in diflubenzuron- and carbaryl-treated plots.

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