A portable pressure-injection machine has proved to be an effective means of treating pear trees for pear decline and may also be useful for injecting other materials into other trees.

Wilbur O. Reil is Staff Research Associate, and James A. Beutel is Extension Pomology Specialist, University of California, Davis. Ideas, suggestions, and assistance are acknowledged from James J. Mehlschau, George Nyland, Roy M. Sachs, Jack DeBie, Robert J. Coffelt, and Richard F. Stallman, academic and staff members, U.C., Davis. Photos by Jack K. Clark, Visual Aids, U.C., Davis.