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Laboratory experiments were conducted at the Nuclear Institute for Food and Agriculture Peshawar, Pakistan to study the tunneling behavior of Heterotermes indicola Wasmann (Isoptera: Heterotermitidae) in soil treated with five concentrations of Chhrpyrifos (400, 200, 100, 50, 25 ppm), Cadusafos(50, 25, 12.5, 6.25, 3.125 ppm) and Agenda (100, 50, 25, 12.5, 6.25ppm) . Heterotemtes indicola traveled longest the cumulative tunnel distance of 6.96 cm at 25 ppm of Chhrpyrifos, 11.20 cm at 3.125 ppm of Cadusafos and 9.56 cm at 6.25 ppm of Agenda tr-eated sand. At lower concentrations toxicity of all insecticides increased with time. Heterotermes indicola tr-aveled longer-tunnel distance and made more number of tunnels at lower concentrations of all the insecticides. In control Heterotermes indicola traveled the longest cumulative distances and made longer and more tunnels than all the treatments. Agenda was slow acting among the three insecticides. The study recommends the use of Chhrpyrifos and Cadusafos for quick knockdown and Agenda for long-term control of termite. [ABSTRACT FROM AUTHOR]