Vaayu binds the physiological receptors thereby causing hypertension which results in immobilization of parts & Yantra work as an anti-feedant and fumigative and it stops their ability to identify food. #Yantra blocks the spiracles of the insects killing them by suffocation & Vaayu kills the insect larvae by fumigant action,the body of larvae is burnt and at once exposed to environment deterioration gives black coloration #Nano Silver ions bind to the molecular component of the microbial cell further deactivate the metabolic system & inhibit further reproduction of the microbes eventually killing it.