TY - JOUR T1 - Improved Trunk Injection for Control of Dutch Elm Disease JF - Arboriculture & Urban Forestry (AUF) SP - 273 LP - 278 DO - 10.48044/jauf.1984.058 VL - 10 IS - 10 AU - William E. Phair AU - George S. Ellmore Y1 - 1984/10/01 UR - http://auf.isa-arbor.com/content/10/10/273.abstract N2 - Conventional preventative injections into healthy trees overlook the properties of elm’s ring-porous wood. The new injector described here forces fungicide into the large earlywood vessels of the outermost growth ring. Only these vessels can conduct fungicide to the entire tree. Older vessels, tapped by conventional injectors actually reduced spread of injected fluids in the outer growth ring in our dye experiments. Of the 55 elms treated with Lignasan by our method for three years, none developed disease symptoms while 11 of the 15 control trees in the same area died. ER -