The toxicity (LT50) of four boric acid dust formulations, ranging in concentration from 40 to 99%, was evaluated at five different relative humidities (0, 12, 57.5, 75, and 100%) and in the presence of liquid water. WS boric acid dust was generally the most toxic formulation at all relative humidities despite having the lowest % boric acid. There was no consistent affect of relative humidity on dust toxicity. However, the LT50 of all dust formulations declined exponentially with increasing amounts of liquid water.
Species 1: Dictyoptera Blattellidae Blattella germanica (German cockroach)
Keywords: Continuous exposure, relative humidity
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA