Chemical growth control of Chinese elm trees
W. D. Hamilton
W.B. Davis, University of California
California Agriculture 21(2):4-5. DOI: 10.3733/ca.v021n02p4.
W. Douglas Hamilton is Farm Advisor, Alumeda County; William B. Davis is Extension Ornamental Horticulturist, University of California, Davis.
A 2500 ppm MH30T spray applied in July appeared to give satisfactory growth control in Chinese elms the following year, at least up to the later part of June—and with less detrimental effects to the trees than other sprays tried. Better results in the use of MHBOT sprays on Chinese elms may come from raising the height of branching to 8 to 10 ft above the ground, and pruning the trees a month before applying the growth-retardant spray.
The material for these tests was supplied by the U. S. Rubber Company, manufacturers of MH30T. Edward Bradley, U. S. Rubber Company research and development representative, assisted with the tests.