Sequential Aminopyralid and Imazapyr Applications for Japanese Knotweed (Fallopia japonica) Management

2017 ◽  
Vol 10 (3) ◽  
pp. 277-283 ◽  
Author(s):  
Nathan S. Boyd ◽  
Scott N. White ◽  
Todd Larsen
Keyword(s):  
Invasive Plant ◽  
Agricultural Land ◽  
Additional Benefit ◽  
Shoreline Erosion ◽  
Stem Density ◽  
Maximum Height ◽  
Japanese Knotweed ◽  
Fallopia Japonica ◽  
Shoot Height ◽  
Disturbed Areas

Japanese knotweed is an invasive plant that occurs along waterways, highways, abandoned agricultural land, and other disturbed areas. It reduces plant diversity and can increase shoreline erosion. An experiment was conducted in Bible Hill and Antigonish, NS, Canada to evaluate early POST aminopyralid at 120 g ae ha−1 and POST imazapyr applications at 720 g ae ha−1 at maximum shoot height, flowering, senescence, maximum height+flowering, maximum height+senescence, flowering+senescence, and maximum height+flowering+senescence. Early POST aminopyralid only provided 10% to 15% control at 52 wk after treatment (WAT) whereas 83% to 100% control occurred following imazapyr applications at all application timings. Percent control at 2, 4, and 8 WAT tended to be higher where imazapyr followed aminopyralid. By 52 WAT, equivalent damage ratings and reductions in stem density occurred at both sites in all plots where imazapyr was applied. The use of aminopyralid or multiple imazapyr applications provided no additional benefit over a single imazapyr application. We conclude that early POST aminopyralid suppresses knotweed growth, which should facilitate late-season imazapyr applications, especially in large stands.

scholarly journals Regeneration and growth in crowns and rhizome fragments of Japanese knotweed (Reynoutria japonica) and desiccation as a potential control strategy

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11783
Author(s):  
Jacob W. Lawson ◽  
Mark Fennell ◽  
Mark W. Smith ◽  
Karen L. Bacon
Keyword(s):  
Plant Material ◽  
Invasive Plant ◽  
Maximum Growth ◽  
Maximum Height ◽  
Japanese Knotweed ◽  
Reynoutria Japonica ◽  
Potential Control ◽  
The North ◽  
Growth Increments ◽  
Herbicide Treatment

Reynoutria japonica (Japanese knotweed) is a problematic invasive plant found in many areas of Europe and North America. Notably, in the UK, the species can cause issues with mortgage acquisition. Control of R. japonica is complicated by its ability to regenerate from small fragments of plant material; however, there remains uncertainty about how much (in terms of mass) rhizome is required for successful regeneration. This study investigated the ability of crowns and rhizomes with different numbers of nodes to regenerate successfully from three sites in the north of England, UK. Two of the sites had been subject to herbicide treatment for two years prior to sampling and the third site had no history of herbicide treatment. No significant differences were observed in regenerated stem diameter, maximum height of stem and maximum growth increments among crowns. All traits measured from the planted crowns were significantly greater than those of the planted rhizome fragments and at least one node was necessary for successful regeneration of rhizomes. The smallest initial fragment weight to regenerate and survive the experiment was 0.5 g. Subjecting all plant material to desiccation for 38 days resulted in no regrowth (emergence or regeneration) after replanting. These findings suggest that desiccation could be a valuable management strategy for small to medium scale infestations common in urban settings.

scholarly journals The Biology of Invasive Alien Plants in Canada. 5. Polygonum cuspidatum Sieb. & Zucc. [= Fallopia japonica (Houtt.) Ronse Decr.]

2006 ◽  
Vol 86 (3) ◽  
pp. 887-906 ◽  
Author(s):  
Jacob N. Barney ◽  
Nishanth Tharayil ◽  
Antonio DiTommaso ◽  
Prasanta C. Bhowmik
Keyword(s):  
North America ◽  
Native Species ◽  
Invasive Plant ◽  
Infested Soil ◽  
Polygonum Cuspidatum ◽  
Japanese Knotweed ◽  
Male Sterile ◽  
Fallopia Japonica ◽  
Riparian Corridors ◽  
Primary Means

Polygonum cuspidatum (Japanese knotweed) is an introduced perennial geophyte in the buckwheat family (Polygonaceae). The phytogeographic distribution of P. cuspidatum in North America suggests a large number of intentional introductions via ornamental plantings from 1870 to 2000, followed by secondary spread from these foci. This species is most pernicious along riparian corridors and road and railroad rights-of-way, reducing visibility, displacing native species, negatively affecting native wildlife, and causing alterations in natural hydrologic processes. Although non-hybrid seed recruitment has not been observed in Europe because of the presence of male-sterile clones only, dispersal of seeds and stem and rhizome fragments by flowing water does occur in North America and populations are readily established from these sources. The primary means of local and regional range expansion is human-mediated transport of rhizome-infested soil. Hybridization is common with the congener P. sachalinense in the introduced ranges of North America and Europe resulting in the equally noxious P. × bohemicum. Key words: Japanese knotweed, Mexican bamboo, Polygonum, Fallopia, Reynoutria, POLCU, invasive plant, weed biology

scholarly journals Invasive Plants in Support of Urban Farming: Fermentation-Based Organic Fertilizer from Japanese Knotweed

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1232
Author(s):  
Rozalija Cvejić ◽  
Susanne Klages ◽  
Marina Pintar ◽  
Lara Resman ◽  
Ana Slatnar ◽  
...  
Keyword(s):  
Invasive Plants ◽  
Chinese Cabbage ◽  
Organic Fertilizer ◽  
Farmyard Manure ◽  
Japanese Knotweed ◽  
Perennial Crop ◽  
Fallopia Japonica ◽  
Suitable Alternative ◽  
Cropping Patterns ◽  
Average Mass

In this study, fermentation-based organic fertilizer (OF) was produced from the aboveground parts of Fallopia japonica (Houtt.) Ronse Decr. The quantity of N in OF (17.2 kg t−1 fresh lactic-fermented OF) was higher than average in cattle farmyard manure, but on a comparable level to solid poultry and rabbit manure. The OF was applied on a field to evaluate its effect on Chinese cabbage. The applied nutrients with OF N159 were 159, 44 and 121 kg ha−1 for N, P, and K, respectively. The applied nutrients with OF N317 were 317, 38, and 200 kg ha−1 for N, P, and K, respectively. The average mass of marketable Chinese cabbage (Brassica pekinensis Rupr.) single heads ranged from 253 g with N0 treatment to 602 g with N317 treatment. The nutrient recovery efficiency REN,P,K was 37, 20, and 50% for N317 and 55, 48, and 77% for N159. The OF was found to be a suitable alternative to farmyard manure. Additionally, OF produced from F. japonica could complement existing approaches to limit the spread of invasive species in cities. Further research should focus on perennial crop rotations and cropping patterns, different soil types, and a greater variety of crops and consider the possible retention of urban farmers using fertilizer from invasive plants.

Glucose oxidase-assisted extraction of resveratrol from Japanese knotweed (Fallopia japonica)

2016 ◽  
Vol 40 (9) ◽  
pp. 8131-8140 ◽  
Author(s):  
Huaguo Chen ◽  
Qingfang Deng ◽  
Xiuhong Ji ◽  
Xin Zhou ◽  
Glen Kelly ◽  
...  
Keyword(s):  
Glucose Oxidase ◽  
Extraction Yield ◽  
Japanese Knotweed ◽  
Fallopia Japonica ◽  
Assisted Extraction

Glucose oxidase can completely convert resveratrol glycoside into resveratrol, and significantly increase the extraction yield of resveratrol in Japanese knotweed.

Extending the Timeframe for Rapid Response and Best Management Practices of Flood-Dispersed Japanese Knotweed (Fallopia japonica)

2015 ◽  
Vol 8 (2) ◽  
pp. 250-253 ◽  
Author(s):  
Brian P. Colleran ◽  
Katherine E. Goodall
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Time Frame ◽  
Rapid Response ◽  
Limiting Factor ◽  
Japanese Knotweed ◽  
Green River ◽  
Fallopia Japonica ◽  
Best Management ◽  
Successful Removal

The objective of this article is to extend the reported period in which flood-distributed knotweed propagules may be successfully managed using only manual labor. During a second round of early detection and rapid response (EDRR) management along the Green River in Guilford, VT, we collected and measured all Japanese knotweed propagules that had been distributed by flooding approximately 21 mo earlier, in August 2011, at a single site. Our data suggest that knotweed s.l. prioritizes the growth of new stems over new rhizomes at the start of a growing season. Because the limiting factor for successful removal of new knotweed s.l. plants by hand is the size of the rhizome system, our findings support extending the time frame for EDRR management of flood-distributed knotweed s.l. into the second spring after its initial dispersal. Additionally, in November 2013, surveys of our work sites found no new knotweed s.l. plants in locations accessible to work crews. In addition to validating our EDRR management techniques, this implies that knotweed s.l. fragment viability does not extend past the second spring following its dispersal.

scholarly journals Synthesis and Physico-Chemical Evaluation of Polyurethane Microstructures for Transmembrane Delivery of Reynoutria japonica Extract

2017 ◽  
Vol 54 (4) ◽  
pp. 651-654
Author(s):  
Florina Ardelean ◽  
Razvan Susan ◽  
Florin Borcan ◽  
Alina Moaca ◽  
Diana Simona Antal ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Invasive Plant ◽  
Aqueous Solubility ◽  
Japanese Knotweed ◽  
Reynoutria Japonica ◽  
Good Thermal Stability ◽  
Starting Point ◽  
First Results ◽  
Polymer Microstructures ◽  
Transmembrane Delivery

Polymer microstructures containing plant extracts are a novel technique used to increase the bioavailability of active agents with low aqueous solubility. Japanese knotweed (Reynoutria japonica) is an invasive plant with multiple biomedical properties. The aim of the present study was to obtain and characterize polyurethane microstructures used as a drug delivery system of a Japanese knotweed extract. The results indicate the obtaining of microstructures with an almost neutral pH, with sizes between 540 and 1134 nm, with a medium stability against the tendency to form clusters and a very good thermal stability. These first results present the potential of the obtained polyurethane microstructures as candidates for the transmembrane drug delivery of Japanese knotweed extracts, as a starting point for further bioactivity investigations.

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