Differences Among Poinsettias in Tolerance to Sulfur Dioxide1

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Howard E. Heggestad U.S. Department of Agriculture, Beltsville, Maryland

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Kenneth L. Tuthill U.S. Department of Agriculture, Beltsville, Maryland

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Robert N. Stewart U.S. Department of Agriculture, Beltsville, Maryland

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Howard E. Heggestad U.S. Department of Agriculture, Beltsville, Maryland

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Kenneth L. Tuthill U.S. Department of Agriculture, Beltsville, Maryland

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Robert N. Stewart U.S. Department of Agriculture, Beltsville, Maryland

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Contributor Notes

Received for publication January 2, 1973. This research was supported in part by the Environmental Protection Agency, National Ecological Research Laboratory, Corvallis, Oregon. Mention of a trademark or name of a proprietary product does not constitute a guarantee or warranty of the product by the USDA, and does not imply its approval to the exclusion of other products that may also be suitable.

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