Left: An adjustable air outlet keeps the spray cloud in the trees. Right: Ultra sonic sensors determine absence, presence, or height The use of pesticides on fruit crops has long been a point of concern to the discerning consumer. Spraying machines applying pesticides have also given rise to concern as they frequently create drift, which reduces efficiency, affects off-target crops and creates environmental pollution and operator contamination. The challenge for Cornell University engineers is to develop a precision canopy sprayer that is able to adjust both application rate and air volume to match the growing canopy as the season progresses. […]