Abstract: The performances and stability of pulse foggers were better than those of other ones, which are used in forestry diseases and insect control. The converse design technique was used to develop a new pulse fogger which would have a higher performance cost ratio and suit domestic application. The weight of the new pulse fogger is only about 8 kg. An attached fuel tank with float has improved the stability of the pulse jet engine. A newly designed starter with a precise fuel supply system and on/off tap has made the machine easy start. A recoiltype pesticide needle valve has increased the foggers safety and convenient shutting.