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 SPX Stops & spreading of powdery mildew, downey mildew and bacterial blight