Diffusion Model On The Efficacy Of Larvicide In Antilarval Operation Of Mosquito Control

摘要

Mosquito control is being performed under chemical, biological and genetic and altogether it is called integrated vector control. In developing countries like India, chemical control has been given priority. Chemicals used as adulticide is becoming resistance among mosquitoes compared to larvicide. Further, the destruction of immature (larvae) stages of mosquitoes is as effective as its distribution is limited whereas adult mosquitoes turned to terrestrial mode of life and its distribution is based on its flight range, habitat, aggregation of man and animals. In this research paper, selective spray treatment over larvae of mosquitoes of a semi-infinite pool is analyzed using diffusion model. Spray chemical is conceived to spread on the surface with time and in space. A critical concentration of spray chemical is envisaged for assumed death of mosquito larvae. Diffusion is modeled Fick' law. Spray losses are lumped into a first order term. Analytical solution of the resulting partial differential equation for various values of diffusivity and loss rate constant are plotted and interpreted. The model would be useful to appraise beforehand how far and for how long spray would be effective and how much of spray chemical is required for effectiveness within specified distance and time.