Abstract
Abstract A miniature pressure injector (mini-injector) was designed specificially to introduce solutions into the vascular system of seedlings and branches of woody plants for research purposes. The mini-injector consists of modified Vise-Grip locking pliers, a stainless steel tapered barrel and disposable syringe. Azo sulfamide dye was successfully injected into 4 species of container-grown fruit trees and 12 species of shade trees. Injections were more consistently effective in June, August, and October than in April. Diffuse-porous species were generally more receptive to injection, especially before bud break, than ring-porous species.
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