Review of Existing Knowledge and Practices of Tarping for the Control of Invasive Knotweeds
Abstract
:1. Introduction
2. Materials and Methods
2.1. Bibliographic Review
2.2. Survey of Knotweed Control through Tarping
3. Results
3.1. Results of the Bibliographic Review
3.1.1. Management Objectives and Environmental Context of Tarping Application
3.1.2. Methodological State of the Art
Preparatory Work
Tarp Installation
3.1.3. Post-Tarping Follow-ups
Monitoring
Tarping Duration and Fabric Removal
3.1.4. Tarping Effectiveness
3.2. Questionnaire Results
3.2.1. Management Objectives and Environmental Context of Tarping Application
3.2.2. Methodological State-of-the Art
Preparatory Work
Tarp Installation
3.2.3. Post Tarping Follow-up
Monitoring
Tarping Duration and Tarp Removal
3.2.4. Tarping Effectiveness
3.3. Consistency of the Results of the Bibliography and the Questionnaire
3.3.1. Management Objectives and Environmental Context of Tarping Application
3.3.2. On Assessing Tarping Effectiveness
4. Recommendations
4.1. Cover the Entire Stand
4.2. Extend up to 2.5 m
4.3. Maintain the Tarping for at Least Six Years
4.4. Use a Durable Synthetic Tarp
4.5. Ensure Long-Term Management
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Author | Duration of the Tarping | Size of the Stand to Control | Preparatory Work | Timing | Distance beyond the Stand Edge | Type of Tarp | Monitoring | Removal of the Tarp | Tarping Effectiveness |
---|---|---|---|---|---|---|---|---|---|
Soll, 2004 | Throughout the growing season | Isolated and smaller patches on open terrain | Cutting (possibly followed by tilling) | Right at the beginning of the year or after cutting the plant a couple of times in the spring | At least 2 m (and preferably 7 m) | Thick black plastic or multiple layers of cardboard | At least for 2 years | n/a | No reliable reports of successful knotweed control with covering |
McHugh, 2006 | Throughout the growing season | Isolated and smaller patches on open terrain | Cutting (possibly followed by tilling) | Right at the beginning of the year or after cutting the plant a couple of times in the spring | At least 2 m (and preferably 7 m) | Thick black plastic or multiple layers of cardboard | Diligent monitoring | n/a | Promising results. Key to success seems to be the strength and the longevity of the geotextile fabrics. Method to consider where herbicide use is restricted |
Hallworth and Sellentin, 2011 | Several years | Small knotweed outbreaks (<0.001 hectares and <10 stems per m2), small patches (e.g., 300 stems or less) | Cutting | n/a | 2 up to 10 m | Woven, heavy grade geotextile or thick cardboard + heavy duty black plasti/poly tarp or geotextile fabric | Continously monitoring for several years | n/a | Not effective along stream banks |
Anderson, 2012 | More than one growing season (up to 3) | Small to medium (0.1 to 2 ha), dense infestations (more than 1000 plants or 30–100% cover) | Cutting | Late spring | Further out | Dark coloured tarp or heavy material (weed barriers or blue poly tarps) | Monitoring for regrowth, rips and tears in the tarp | n/a | This method may need to be used in conjunction with another method to ensure the entire patch is controlled |
Godmaire and Houbart, 2014 | At least 5 years | Medium (from 10 to 40 m2) to large (up to 40 m2) | Mowing or cutting | Late spring | A few meters | Dark coloured tarp (as geotextile, geomembrane or polyethylene tarp) | Regular monitoring | n/a | Not recommended in shaded areas |
King County, 2015 | At least 5 growing seasons (longer if soil is wet) | Reasonably small (50 stems or less), isolated patches | Cutting | At the beginning of the year or after cutting the plant down several times during the growing season | At least 2 m beyond | Geotextile or heavy duty black plastic | Intensive monitoring: every 2 to 4 weeks during the growing season | n/a | Moderately effective |
Branquart et al., 2018 | More than 5 years, up to 8 years | Small (less than 50 m2, because of the high cost of the tarp) | Uprooting or herbicide injection or mowing | Winter or spring (to limit the biomass to be evacuated) | 4 to 5 m | Large non-woven geotextile or tarp class 5 (tensile strength greater than 16 kN and density greater than or equal to 240 g/m2) | Monitoring at least twice a year | Yes for exposed tarps; No for covered tarps | Mitigation method: very rapid weakening of the knotweed, may lead to its long-term elimination |
Comité ZIP des Seigneuries et al., 2018 | At least 8 years | n/a | Cutting and excavation (manually or with an excavator) up to 2 m beyond the stand | n/a | At least 2 m | Geomembrane: Texel 800 series or 45 mil ethylene-propylene-diene monomer (EPDM) membrane or Georoute 9 | Regular monitoring over several years | Yes | n/a |
Cygan, 2018 | 5 years | n/a | Cutting and spreading a layer of mulch, grass clippings or other material over the cut stems (to prevent them from puncturing the tarp) | June (when rhizomes are weakest) | A few feet beyond | 7-mil Black plastic or non-woven geotextile or heavy-duty dark colored tarp | n/a | Yes | Very effective alternative if you wish to avoid the use of herbicides/very successful in sensitive areas |
Guerin and Hedont, 2019 | Several years, at least 10 years for some | Small (from a dozen to a few hundred m2, as it is heavy to implement) | Uprooting or mowing | All seasons | 1 to 2 m | New, black and opaque tarps. Geomembrane, agricultural tarp or biodegradable geotextile (non-woven) | Monitoring once or twice a year | Yes | One of the most appropriate methods for eradicating the outbreak of vegetatively propagated herbaceous plants |
Lavoie, 2019 | Up to 7 years | Tarps are too expensive to be laid out over large areas | n/a | n/a | n/a | Geomembrane or rugged geotextile | Regular monitoring | Yes | Popular but few efficacy tests. Mixed results |
SPIGEST, 2019 | At least 3 years | Small (less than 500 m2) | Mowing in the winter before laying the tarp | Before vegetation regrowth | 1 m | Black agricultural tarp (2 layers) | Regular monitoring: at least in the first years, once a month, from May to October. | Yes | Effective method for weakening rhizomial reserves before the establishment of plant competition |
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Dusz, M.-A.; Martin, F.-M.; Dommanget, F.; Petit, A.; Dechaume-Moncharmont, C.; Evette, A. Review of Existing Knowledge and Practices of Tarping for the Control of Invasive Knotweeds. Plants 2021, 10, 2152. https://doi.org/10.3390/plants10102152
Dusz M-A, Martin F-M, Dommanget F, Petit A, Dechaume-Moncharmont C, Evette A. Review of Existing Knowledge and Practices of Tarping for the Control of Invasive Knotweeds. Plants. 2021; 10(10):2152. https://doi.org/10.3390/plants10102152
Chicago/Turabian StyleDusz, Marie-Anne, François-Marie Martin, Fanny Dommanget, Anne Petit, Caroline Dechaume-Moncharmont, and André Evette. 2021. "Review of Existing Knowledge and Practices of Tarping for the Control of Invasive Knotweeds" Plants 10, no. 10: 2152. https://doi.org/10.3390/plants10102152