Abstract
One-year-old seedlings of silver maple ( Acer saccharinum L.) and American sycamore ( Platanus occidentalis L.) were treated with daminozide [butanedioic acid mono (2,2-dimethylhydrazide)] or maleic hydrazide (1,2-dihydro-3,6-pyridazine dione) via stem injection. Six weeks after treatment with maleic hydrazide, plants of both species were shorter, had less leaf area and less total dry weight than untreated plants. During the same period, daminozide reduced plant height and leaf area of treated maple seedlings while reducing leaf area and total dry weight of treated sycamore. Daminozide had no influence on height of sycamore or total dry weight of silver maple. Both chemicals caused a decrease in net photosynthesis; however, seedlings injected with daminozide overcame this effect 2–3 weeks after treatment.
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