Abstract:Aiming at the shortcomings of specialized plant protection machinery for trellised vine and the low-level efficiency of pesticide application, a Π-type recycling tunnel sprayer for the liquid that was not retained by the leaves was developed. Spray recycling and deposit in canopy were measured. Results showed that it could increase chemical recovery rate up to 44.0% and 18.4% respectively and increase the deposition on the underside of leaves and leaved inside canopy by assembling booms interlaced and turning nozzles upward. Grid end shield could deflect air direction effectively to increase chemical recovery rate more than 10%.