Indoxacarb

Insecticides used were indoxacarb (15% a.i., DuPont, Wilmington, DE) and fipronil (9.1% a.i., BASF Corp., Research Triangle Park, NC). Calculated amounts of an indoxacarb solution (ca. 1.0 mL) were applied uniformly to Whatman No. 1 filter paper (Whatman International Ltd., Maidstone, UK) placed in glass Petri dishes to obtain 50, 75, and 100 ppm indoxacarb-treated filter paper. The procedure was repeated for fipronil to obtain 0.5, 1, and 5 ppm fipronil-treated filter paper. The same stock insecticide solutions were used to treat the filter paper used against both termite species at all temperatures. Filter paper treated with distilled water was used as control treatment. Treated papers were air-dried in a laboratory hood for 24 h at about 23 °C and moistened with 0.4 mL of distilled water immediately before the introduction of termites.