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Control of Black Oak and Tanoak in the Sierra Cascade Range

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Broadcast, directed, and stem injection herbicide techniques were applied to 3- to 8-year-old black oak (Quercus kelloggii) and 3-year-old tanoak (Lithocarpus densiflorus) clumps (directed applications only). Broadcast applications of imazapyr at all rates to black oak and directed applications of imazapyr to tanoak performed better with the addition of an adjuvant compared to treatments without the adjuvant. However, even with an adjuvant, broadcast treatments of imazapyr at or below 560 g acid equivalent (ae/ha) only suppressed black oak growth and did not provide long-term control. Directed applications of imazapyr gave excellent control of both black oak (0.43–2.17% ae plus Sylgard) and tanoak (0.14–1.13% ae plus Hasten) clumps. Imazapyr was more effective than basal bark treatments with triclopyr (8.9% ae), and tank-mixing imazapyr with glyphosate did not improve the level of control. Stem injection treatment of black oak trees or clumps with imazapyr was very effective with nearly all rates and hack intervals, but late summer or fall applications gave greater suppression of basal re-sprouts compared to spring and early summer treatments. These results demonstrate that imazapyr is a very effective and versatile tool for the control of black oak and tanoak clumps and black oak trees. West. J. Appl. For. 19(4):268–276.
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Keywords: Lithocarpus densiflorus; Quercus kelloggii; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; imazapyr; natural resource management; natural resources; stem injections

Document Type: Regular Article

Affiliations: 1: Weed Science Program, Department of Vegetable Crops University of California Robbins Hall Davis CA 95616 Phone: (530) 754-8715;, Fax: (530) 752-4604, Email: [email protected] 2: Weed Science Program, Department of Vegetable Crops University of California Robbins Hall Davis CA 95616 3: Roseburg Forest Products Co. P.O. Box 680 Weed CA 96094

Publication date: 2004-10-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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