author(s)
Kamran Sohail, Imtiaz Ali Khan, Muhammad Misbah Ul Haq, Muhammad Usman, Syed Fahad Shah, Amjid Mehmood, Toheed Iqbal, Fakhruddin

abstract
Insecticidal studies on Heterotermes indicola Wasmann (Isoptera: Heterotermitidae) were carried out under laboratory conditions at the Nuclear Institute for Food and Agriculture (NIFA), Peshawar, Pakistan during 2010. Chlorpyrifos, Cadusafos and Agenda each were tested in five concentrations, i.e. 100, 50, 25, 12.5 and 6.25 ppm against H. indicola along with a control. Chlorpyrifos yielded highest mortalities of > 80% against H. indicola at 100 and 50 ppm after 8 h and all concentrations after 24 and 48 hours. Cadusafos was second in toxicity against H. indicola where it caused more than 80% mortalities at 100 ppm after 8h and at 100, 50 and 25 ppm after 24 and 48 hours. Agenda caused no mortalities at all concentrations after 8 h, but it yielded 14 to 33% mortalities after 24 and 48 h. After 15 days, however, toxicity of Chlorpyrifos and Cadusafos against H. indicola was reduced with all the concentrations. Onrnthe other hand, toxicity of Agenda increased with time, where it ranged from 25-50% after 8 h, 42-65% after 24 h and 80-92% after 48 h with all concentrations after 15 days. Toxicity of all the insecticides increased in a dose dependent manner. Generally, Chlorpyrifos, and Cadusafos showed quick while Agenda resulted slow toxicity against H. indicola under laboratory conditions.