Table 1.

Percentage (mean ±SEM) of morphologically normal adults resulting from exposure of late instars of Tribolium castaneum and Tribolium confusum on concrete, tile, or wood treated with the methoprene at the rate of 3.0 mg active ingredient (A1)/m². Bioassays were conducted | day after the surfaces were treated (week 0) and again after 4, 8 and I 6 weeks, using different treated arenas at each exposure interval.