Influence of Sulfur Dioxide Fumigation on Regrowth of American Sycamore Seedlings Treated with Maleic Hydrazide1

in HortScience
Authors:
B. R. RobertsU.S. Department of Agriculture, Science and Education Administration, Agricultural Research, Nursery Crops Research Laboratory, Delaware, OH 43015

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S. C. DomirU.S. Department of Agriculture, Science and Education Administration, Agricultural Research, Nursery Crops Research Laboratory, Delaware, OH 43015

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Abstract

Two-year-old containerized seedlings of American sycamore (Platanus occidentals L.) were treated with maleic hydrazide (MH) before, after, or in the absence of sulfur dioxide (S02) fumigation. Exposure to S02 did not reduce the effectiveness of MH in controlling regrowth of this species. A strong negative linear trend was observed between SO2 concentration and sprout growth, either with or without MH treatment. In all instances, exposure to 1.0 ppm S02 resulted in high levels of phytotoxicity.

Contributor Notes

Received tor publication April 18, 1981). This work was supported in part by the Electric Power Research Institute. Palo Alto. CA 94304.

The cost of publishing this paper was defrayed in part by the payment ot page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

The authors are grateful to the U.S. Forest Service. Northeastern Forest Experiment Station tor providing the fumigation chambers used in this study, and W. F. Kwolek for assistance with the statistical analysis.

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