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Title: Tolerance of loblolly pine seedlings to glyphosate
Author(s): Haywood, James D.; Melder, Thomas W.
Date: 1990
Source: In: Coleman, Sandra S.; Neary, Daniel G., comps., eds. Proceedings of the 6th biennial southern silvicultural research conference; 1990 October 30-November 1; Memphis, TN. Gen. Tech. Rep. 70. Asheville, NC: U.S. Department of Agriculture, Forest Service, southeastern Forest Experiment Station: 163-170. Vol. 1.
Description: Broadcasting glyphosate herbicide over loblolly pine (Pinus taeda L.) may provide enough early-season weed control to allow seedlings to establish themselves more rapidly, but glyphosate can, injure young trees. To examine the question of seedling injury, four rates of glyphosate were broadcast evenly over planted loblolly pine seedlings, competing vegetation, and plot surface. The rates were 0.42, 0.84, 1.26, and 1.68 kg acid equivalent per hectare (1 pt, 1 qt, 1.5 qt, and 2 qt Roundup herbicide per acre). Treatments were made on six separate dates, from April 23 through October 14, of the first growing season. Although glyphosate effectively controlled competing vegetation, all treatments injured the pine seedlings and reduced height growth, and many treatments increased pine mortality.
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