Publication Details

Treating Japanese barberry (Berberis thunbergii) during the dormant season

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Ward, Jeffrey S.; Williams, Scott C.

Year Published

2013

Publication

In: Miller, Gary W.; Schuler, Thomas M.; Gottschalk, Kurt W.; Brooks, John R.; Grushecky, Shawn T.; Spong, Ben D.; Rentch, James S., eds. Proceedings, 18th Central Hardwood Forest Conference; 2012 March 26-28; Morgantown, WV; Gen. Tech. Rep. NRS-P-117. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 182-191.

Abstract

Japanese barberry (Berberis thunbergii) is an invasive shrub that can suppress forest regeneration and increase the risk of exposure to Lyme disease. In 2008, we began a study in central Connecticut to examine the efficacy of treating barberry infestations during the dormant season (October-March). Techniques included basal spray (triclopyr in oil) and clearing saw cutting with a wet-blade application of triclopyr. Dormant season techniques were compared with a glyphosate foliar spray applied in September. Foliar application resulted in a greater reduction of barberry cover (94 percent) compared to basal spray (84 percent) and wet-blade treatments (74 percent). Treatment effectiveness did not differ among months for either of the dormant season techniques. Labor costs did not differ among techniques, averaging 0.13 hours/acre/percent cover (i.e., 3.9 hours for a 1 acre stand with 30 percent barberry abundance). There was a large difference among treatments in amount of herbicide applied with 0.6 (±0.1), 1.4 (±0.4), and 2.8 (±0.4) ounces/acre/percent cover for wet-blade clearing saw, foliar spray, and basal spray applications, respectively. While not as effective as foliar spraying, wet-blade clearing saw and basal spray applications provide an opportunity to control barberry during the dormant season. Wet-blade clearing saw technique can reduce the amount of applied herbicide.

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Citation

Ward, Jeffrey S.; Williams, Scott C. 2013. Treating Japanese barberry (Berberis thunbergii) during the dormant season. In: Miller, Gary W.; Schuler, Thomas M.; Gottschalk, Kurt W.; Brooks, John R.; Grushecky, Shawn T.; Spong, Ben D.; Rentch, James S., eds. Proceedings, 18th Central Hardwood Forest Conference; 2012 March 26-28; Morgantown, WV; Gen. Tech. Rep. NRS-P-117. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 182-191.

Last updated on: September 17, 2013