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Soil Spot Herbicides for Single-Stem Hardwood Control

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Soil spot treatments of undiluted VelparĀ® L and a concentrated mixture of SpikeĀ® 80W were applied around test trees of five hardwood species. The test rates were 2, 4, and 6 ml of herbicide/in. of dbh applied to the soil within 3 ft of each tree Hardwood topkill was assessed after two growing seasons. The 4-ml rate of Velpar L was required to achieve 80% or greater average topkill of sweetgum (Liquidambar styraciflua) and water oak (Quercus nigra) on loamy soils, while a 6-ml rate was needed to exceed 80% topkill of dogwood (Cornus florida). Spike 80W gave about 80% topkill of both water oak and dogwood at the 2-ml rate but was ineffective on sweetgum. Only Spike 80W at the 6-ml rate yielded greater than 70% average topkill of boxelder (Acer negundo) and hophornbeam (Ostrya virginiana). Nearby hardwoods of susceptible species within 3 ft of treated trees were also killed, extending the cost-effectiveness of these hardwood control treatments. South. J. Appl. For. 12(3):199-203.
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Document Type: Journal Article

Affiliations: USDA Forest Service, Southern Forest Experiment Station, the George W. Andrews Forestry Sciences Laboratory, Auburn, AL 36849

Publication date: 01 August 1988

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