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Home Publications Tree Planters' Notes Tree Planters' Notes Volume 49, Number 3 (2000) Comparison of Adjuvants Used in Fall-Release Herbicide Mixtures for Forest Site Preparation

Comparison of Adjuvants Used in Fall-Release Herbicide Mixtures for Forest Site Preparation

Tank mixes of the herbicides imazapyr and glyphosate were applied at 3 rates with 3 adjuvants (LI-700® , Nu-Film-IR®, Silwet L-77°) over California hazelnut (Corylus cornuta Marsh. var. californica (A. DC.) Sharp), vine maple (Acer circina turn Pursh), and brackenfern (Pteridium aquilinum (L.) Kuhn var. lanuginosum (Bong.) Fern.). The herbicide 2,4-D was applied at 3 rates with 2 adjuvants (Herbimax®, Nu-Film-IR) over greenleaf manzanita (Arctostaphylos patula Greene). Tank mixes of imazapyr and glyphosate with LI- 700 or Nu-Film-IR were sprayed at 3 rates over seedlings of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco.). The herbicide rate strongly influenced the percentage of foliage injured and percentage of stems killed for all herbicide treatments. The adjuvants evaluated did not influence efficacy of herbicide applications on California hazelnut, vine maple, or brackenfern. Herbimax increased visual foliar damage resulting from 2,4-D application on greenleaf nianzanita. Douglasfir foliage was damaged by the higher herbicide rates; the damage was greater from Nu-Film-IR than from LI-700. Tree Planters' Notes 49(3): 66-71; 2000.

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Author(s): J. Scott Ketchum, Robin Rose, Bruce R. Kelpsas

Publication: Tree Planters' Notes - Volumes 49, Number 3 (2000)

Section: Research Report

Volume: 49

Number: 3

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