SUMMARY
The failure of traditional vector control operations through chemical insecticides renewed interest in biological control method. In the present study Dragonfly (Brachytron pratense) nymph has been proved to be a strong biocontrol agent of Anopheles suhpictus larvae in the laboratory condition. Average daily larval feeding rate of B. pratense nymph decreased when the search area was increased. Feeding rate increased when prey density was increased. In the field conditions also, B. pratense played very effective role as predator of different species of larval mosquitoes.