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Simazine May Stunt Young European Larch

Growth of young European larch (Larix decidua Mill.), weeded with the herbicide simazine 80W, was measured in a plantation near La Crosse, Wis. This study was prompted by an earlier observation in which it was noted that many larch leaves had died following application of simazine. The plantation studied contained four blocks of 2-0 stock planted in April 1967. Each block had 25 rows of 20 trees each, for a total of 500 trees. The blocks were densely covered with Kentucky Bluegrass, alfalfa, wild carrot, and other weeds up to 3 feet high that were competing with the new seedlings. In October 1967, simazine 80W was applied at a rate of 5 pounds per acre using a backpack sprayer. A 2-foot-diameter circle around each tree in every other row was sprayed. Care was taken to avoid spraying the tree foliage. The concentration used was that recommended by the University of Wisconsin 1 for general use in weeding conifer plantations.


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Author(s): M. Dean Knighton

Publication: Tree Planters' Notes - Volume 21, Number 2 (1970)

Volume: 21

Number: 2