Controlling an Invasive Shrub, Japanese Barberry (Berberis thunbergiiDC), using Directed Heating with Propane Torches

2011 ◽  
Vol 31 (2) ◽  
pp. 156-162 ◽  
Author(s):  
Jeffrey Ward ◽  
Scott Williams
Keyword(s):  
Invasive Shrub ◽  
Japanese Barberry

Effectiveness of Two-Stage Control Strategies for Japanese Barberry (Berberis thunbergii) Varies by Initial Clump Size

2010 ◽  
Vol 3 (1) ◽  
pp. 60-69 ◽  
Author(s):  
Jeffrey S. Ward ◽  
Scott C. Williams ◽  
Thomas E. Worthley
Keyword(s):  
Initial Treatment ◽  
Prescribed Burning ◽  
Treatment Effectiveness ◽  
Control Strategies ◽  
Effective Control ◽  
Invasive Shrub ◽  
Japanese Barberry ◽  
Canadian Provinces ◽  
Clump Size

AbstractJapanese barberry is listed as an invasive shrub in 20 states and four Canadian provinces. Control of Japanese barberry was evaluated using several two-step processes over 16 mo using a total of 1,100 clumps at six study areas. Initial treatments in spring (prescribed burning, mechanical mowing with a brush saw or rotary wood shredder) reduced the size of established barberry clumps. Follow-up treatments in midsummer to kill new ramets that developed from surviving root crowns were foliar applications of triclopyr or glyphosate, directed heating with a propane torch, and untreated controls. Mortality was defined as the absence of ramets from a root crown and not the mortality of individual ramets of a given clump. Clump mortality and size of new ramets did not differ among initial treatments. However, larger clumps had higher survival and larger sprouts than smaller clumps 16 mo after initial treatment. Effectiveness of follow-up treatments varied by clump size. Two follow-up treatments of directed heating using propane torches were as effective as herbicides for clumps that were initially smaller than 120 cm. For clumps with pretreatment sizes of 120 cm and larger, clump mortality following herbicide treatments (90%) and directed heating (65%) was greater than for clumps that had no follow-up treatments (35%). Although clump sizes did not differ between follow-up methods 1 yr after treatment, both follow-up treatments resulted in smaller clumps than untreated controls. Effective control of Japanese barberry can be achieved in a single growing season by integrating an early-season initial treatment (prescribed fire or mechanical) that kills the aboveground tissues with a midseason follow-up treatment such as directed heating or targeted herbicide application.

An Assessment of Japanese Barberry in Northern U.S. Forests

2018 ◽  
Author(s):  
Cassandra M. Kurtz ◽  
Mark H. Hansen
Keyword(s):  
Japanese Barberry

Selective herbicides for control of hen’s eyes (Ardisia crenata) in forests and natural areas

2019 ◽  
Vol 12 (4) ◽  
pp. 229-235
Author(s):  
Richard Cristan ◽  
Patrick J. Minogue ◽  
Stephen F. Enloe ◽  
Brent Sellers ◽  
Anna Osiecka
Keyword(s):  
United States ◽  
Coastal Plain ◽  
Southeastern United States ◽  
High Rate ◽  
Natural Areas ◽  
Invasive Shrub ◽  
Herbicide Treatments

AbstractHen’s eyes (Ardisia crenata Sims) is a shade-tolerant invasive shrub displacing native understory in forests of the Coastal Plain of the southeastern United States. Few studies have explored herbicide effectiveness on A. crenata, with foliar applications of triclopyr amine or triclopyr ester typically referenced as the standard treatments. This study evaluated efficacy of eight foliar herbicide treatments and a nontreated check at three locations at 12 mo after the first treatment (12MAT1) and 12 mo after the second treatment (12MAT2) on established (greater than 8-cm high) and seedling (less than 8-cm high) A. crenata. Treatments were four triclopyr formulations: amine, ester, choline, and acid (all at 4.04 kg ae ha−1); imazamox (1.12 and 2.24 kg ae ha−1); flumioxazin (0.43 kg ai ha−1); and triclopyr amine plus flumioxazin (4.04 + 0.43 kg ae ha−1). At 12MAT1, triclopyr ester, the high rate of imazamox, and triclopyr acid resulted in greater control of established A. crenata than any other herbicide (68%, 66%, and 64%, respectively). At 12MAT2, all herbicides except flumioxazin resulted in some control of A. crenata. Triclopyr ester, triclopyr acid, and the high rate of imazamox provided 95%, 93%, and 92% control, respectively. Triclopyr choline did not perform as well as the acid or ester formulations, and the tank mix of flumioxazin and triclopyr amine did not improve control over triclopyr amine alone. This study identified triclopyr acid and imazamox (2.24 kg ae ha−1) as new options for A. crenata control and indicated variation in the performance among the four triclopyr formulations.

Diminished Plant Richness and Abundance Below Lonicera maackii, an Invasive Shrub

2002 ◽  
Vol 147 (1) ◽  
pp. 60-71 ◽  
Author(s):  
MATTHEW H. COLLIER ◽  
JOHN L. VANKAT ◽  
MICHAEL R. HUGHES
Keyword(s):  
Lonicera Maackii ◽  
Plant Richness ◽  
Invasive Shrub

scholarly journals Soil texture and other site-level factors differentially affect growth of Scotch broom (Cytisus scoparius) and Douglas-fir (Pseudotsuga menziesii) seedlings in the western Pacific Northwest

2021 ◽  
Author(s):  
David Carter ◽  
Robert A. Slesak ◽  
Timothy B. Harrington ◽  
Anthony W. D’Amato
Keyword(s):  
Pacific Northwest ◽  
Pseudotsuga Menziesii ◽  
Height Growth ◽  
Douglas Fir ◽  
Western Pacific ◽  
Limiting Factor ◽  
Cytisus Scoparius ◽  
Invasive Shrub ◽  
Scotch Broom ◽  
The Western Pacific

The invasive shrub Scotch broom (Cytisus scoparius (L.) Link) is a pervasive threat to regenerating Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) stands in the Pacific Northwest, USA. Field observations indicate that the susceptibility of areas to Scotch broom invasion and dominance can vary by site. We selected ten sites throughout the western Pacific Northwest that spanned a gradient of soil textures and other factors to test the site-specific susceptibility of Douglas-fir to overtopping by Scotch broom. We expected to find that the ability of Scotch broom to dominate a site was mediated by site-level factors, particularly those influencing soil water – the most limiting factor to growth in the region. We found Scotch broom and Douglas-fir were inversely affected by site-level factors. In general, Douglas-fir absolute height growth rates were more competitive with those of Scotch broom on fine-textured soils than on more coarsely textured soils. We also found Douglas-fir to have a more dramatic response to increasing down woody material than Scotch broom. Scotch broom height growth approached an asymptote at 3 m. Sites with fast-growing Douglas-fir were able to surpass this height six to seven years after planting and appear likely to avoid suppression by Scotch broom.

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