scholarly journals Efficacy of florpyrauxifen-benzyl for eurasian watermilfoil control and nontarget Illinois pondweed, elodea, and coontail response

2021 ◽  
Author(s):  
Christopher Mudge ◽  
Bradley Sartain ◽  
Benjamin Sperry ◽  
Kurt Getsinger
Keyword(s):  
Myriophyllum Spicatum ◽  
Benzyl Ester ◽  
Elodea Canadensis ◽  
Short Exposure ◽  
Ceratophyllum Demersum ◽  
Eurasian Watermilfoil ◽  
Low Concentrations ◽  
Aquatic Herbicide ◽  
Target Plant ◽  
Myriophyllum Spicatum L

This research evaluated low concentrations and short exposure times of the recently registered aquatic herbicide florpyrauxifen-benzyl (4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoro-pyridine-2-benzyl ester) on the target plant Eurasian watermilfoil (Myriophyllum spicatum L., hereafter referred to as EWM) as well as selectivity towards the nontarget submersed species Illinois pondweed (Potamogeton illinoensis Morong), elodea (Elodea canadensis Michx.), and coontail (Ceratophyllum demersum L.)

Absorption and Translocation of Florpyrauxifen-benzyl in Ten Aquatic Plant Species

Weed Science ◽  
2021 ◽  
pp. 1-21
Author(s):  
Erika J. Haug ◽  
Khalied A. Ahmed ◽  
Travis W. Gannon ◽  
Rob J. Richardson
Keyword(s):  
North Carolina ◽  
Plant Species ◽  
Aquatic Plant ◽  
Myriophyllum Spicatum ◽  
Hydrilla Verticillata ◽  
State University ◽  
North Carolina State University ◽  
Eurasian Watermilfoil ◽  
Body Of Knowledge ◽  
Aquatic Herbicide

Abstract Additional active ingredients are needed for use in aquatic systems in order to respond to new threats or treatment scenarios, enhance selectivity, reduce use rates, and to mitigate the risk of herbicide-resistance. Florpyrauxifen-benzyl is a new synthetic auxin developed for use as an aquatic herbicide. A study was conducted at North Carolina State University, in which 10 µg L−1 of 25% radiolabeled florpyrauxifen-benzyl was applied to the isolated shoot tissue of ten different aquatic plant species in order to elucidate absorption and translocation patterns in these species. Extremely high levels of shoot absorption were observed for all species and uptake was rapid. Highest shoot absorptions were observed for crested floatingheart [Nymphoides cristata (Roxb.) Kuntze] (A192 =20 µg g−1), dioecious hydrilla [Hydrilla verticillata (L.f.) Royle] (A192 =25.3 µg g−1), variable watermilfoil (Myriophyllum heterophylum Michx.) (A192 =40.1 µg g−1) and Eurasian watermilfoil (Myriophyllum spicatum L.) (A192 =25.3 µg g−1). Evidence of translocation was observed in all rooted species tested with the greatest translocation observed in N. cristata (1.28 µg g-1 at 192 HAT). The results of this study add to the growing body of knowledge surrounding the behavior of this newly registered herbicide within aquatic plants.

scholarly journals Comparison of generic and proprietary aquatic herbicides for control of invasive vegetation; part 3 : submersed plants

2021 ◽  
Author(s):  
Christopher Mudge ◽  
Kurt Getsinger
Keyword(s):  
Active Ingredient ◽  
Myriophyllum Spicatum ◽  
Hydrilla Verticillata ◽  
Growth Chamber ◽  
Small Scale ◽  
Ceratophyllum Demersum ◽  
Eurasian Watermilfoil ◽  
Severity Of Injury ◽  
Aquatic Herbicides ◽  
Generic Products

Herbicide selection is key to efficiently managing nuisance vegetation in our nation’s waterways. After selecting the active ingredient, there still remains multiple proprietary and generic products to choose from. Recent small-scale research has been conducted to compare the efficacy of these herbicides against floating and emergent species. Therefore, a series of mesocosm and growth chamber trials were conducted to evaluate subsurface applications of the following herbicides against submersed plants: diquat versus coontail (Ceratophyllum demersum L.), hydrilla (Hydrilla verticillata L.f. Royle), southern naiad (Najas guadalupensis (Sprengel) Magnus), and Eurasian watermilfoil (Myriophyllum spicatum L.); flumioxazin versus coontail, hydrilla, and Eurasian watermilfoil; and triclopyr against Eurasian watermilfoil. All active ingredients were applied at concentrations commonly used to manage these species in public waters. Visually, all herbicides within a particular active ingredient performed similarly with regard to the onset and severity of injury symptoms throughout the trials. All trials, except diquat versus Eurasian watermilfoil, resulted in no differences in efficacy among the 14 proprietary and generic herbicides tested, and all herbicides provided 43%–100% control, regardless of active ingredient and trial. Under mesocosm and growth chamber conditions, the majority of the generic and proprietary herbicides evaluated against submersed plants provided similar control.

scholarly journals Structure of epiphyton communities on Lake Baikal submerged macrophytes

2012 ◽  
Vol 12 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Galina Pomazkina ◽  
Lyubov Kravtsova ◽  
Ekaterina Sorokovikova
Keyword(s):  
Lake Baikal ◽  
New Records ◽  
Submerged Macrophytes ◽  
Myriophyllum Spicatum ◽  
Elodea Canadensis ◽  
Ceratophyllum Demersum ◽  
Potamogeton Perfoliatus ◽  
Low Diversity ◽  
Quantitative Characteristics ◽  
Quantitative Development

Abstract We carried out a first study of Lake Baikal epiphyton on six species of submerged macrophytes: Myriophyllum spicatum L., Potamogeton perfoliatus L., Potamogeton sp., Sparganium gramineum Georgi, Ceratophyllum demersum L., and Elodea сanadensis Michaux. We identified 70 epiphyton species and intraspecific taxa belonging to 3 phyla, viz. Ochrophyta, Cyanobacteria, and Chlorophyta. Nine species of Cyanobacteria were new records for Lake Baikal. Epiphyton communities differing in species composition and quantitative characteristics grew on diverse species of submerged macrophytes. High levels of species richness were recorded on Sparganiumgramineum and Potamogeton sp., whereas low diversity of epiphyton was observed on Myriophyllum spicatum and Elodea canadensis. A monodominant community was revealed on the invasive Elodea canadensis represented by Cocconeis placentula var. placentula. Specific characteristics of morphology of submerged macrophytes influenced the structural organization and quantitative development of epiphyton. Epiphyton abundance and biomass were higher on upper sections of most plants than on lower sections, probably because of canopy shading of macrophyte lower portions.

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