Present study was conducted to determine the toxicity and bioavailability of Biflex (Bifenthrin) and Fipronil (Phenyl pyrazole) termiticides against common termite species Heterotermes indicola (wasmann). Soil was collected from ten different areas of Lahore and was divided into sandy clay loamy (SLC) soil and sandy loamy (SL) soil after analysis. Laboratory bioassays (Topical application method and soil contact method) were conducted to determine bioavailability ratio of Biflex and Fipronil in each type of the soil. Based on calculated bioavailability ratios it was seen that Biflex was more bioavailable (0.888 in SCL soil and 0.765 in SL soil) to the target termites than Fipronil (0.459 and 0.302 in SCL and SL soil respectively). In topical treatment both termiticides showed highest mortality (25.0 ±0.00). In the same way in soil contact bioassay Biflex showed highest mortality rate (25.0 ±0.00 in SCL and 24.66±0.33 in SL soil) at 5ppm while Fipronil treatment showed moderate mortality (24.33±0.667 in SCL and 23.0±0.00 in SL soil) at same concentration. Regarding soil type both termiticides had more efficacies in sandy clay soil as compared to sandy soil. From statistical analysis it was observed that there was significant difference in the mortality as compared to control (P<0.005).

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