Equipment for Precise Placement of Pesticides on Shade Trees

Abstract

Spraying shade trees for insect and disease control requires thorough coverage of leaf, stem, and trunk surfaces. Much more energy is required than for ground spraying because of the greater distance the spray must be projected and the necessity for covering large surface areas. Tree spraying is normally accomplished with either high-pressure, high-volume hydraulic sprayers or air-carrier sprayers. Hydraulic sprayers use pressure in the liquid system to im- part sufficient velocity to the spray droplets to pro- pel them from the point of release to the point of application. Air-carrier sprayers use an airstream to transport and distribute the spray droplets; they may use either high- or low-pressure liquid systems