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|Other Names:||Monosodiumtaurocholicacid||Cas No.:||219714-96-2|
|Application:||Herbicide,Weedicide,Agriculture,Control Annual Weeds And Grasses,Agrochemical & Pesticide||Classification:||Herbicide|
10%OD penoxsulam herbicide,
CAS 219714 96 2 penoxsulam herbicide,
10% OD organic systemic herbicide
Penoxsulam was registered with the EPA for aquatic use in 2009.
The active ingredient is 2-(2,2-difluoroethoxy)—6-(trifluoromethyl-N-(5,8-dimethoxy[1,2,4] triazolo[1,5,-c]pyrimidin-2-yl)) benzenesulfonamide).
It is a liquid and is used for large-scale control of submerged, emergent and floating-leaf vegetation.
Aquatic Use and Considerations
Penoxsulam is a systemic herbicide that moves throughout the plant tissue and prevents plants from producing a necessary enzyme, acetolactate
synthase (ALS), which is not found in animals. Susceptible plants will stop growing soon after treatment and become reddish at the tips of the
plant. Plant death and decomposition will occur gradually over several weeks to months. Penoxsulam should be applied to plants that are actively
growing; mature plants require a higher concentration of herbicide and a longer contact time.
Penoxsulam must remain in contact with plants for around 60 days. A supplemental “bump” treatment may be needed to maintain the herbicide
concentration for the required contact time. Because of this long contact period, penoxsulam is likely to be used for larger-scale or whole-lake
treatments and should not be used where rapid dilution can occur such as spot treatments or moving water.
Penoxsulam may be used to treat the invasive Eurasian watermilfoil (Myriophyllum spicatum). In other parts of the country, it is valuable as a
rotational herbicide against the invasive plant hydrilla (Hydrilla verticillata). Desirable native species that may also be affected include sago
pondweed (Stuckenia pectinata), Illinois pondweed (Potamogeton illinoensis), pickerelweed (Pontederia cordata), duckweeds (Lemna spp.) and
arrowhead (Sagittaria spp.).
It is important to note that repeated use of herbicides with the same mode of action can lead to herbicide-resistant plants, even in aquatic plants.
More resistant weeds have developed to the ALS inhibitor herbicides than to other herbicide types, and so this mechanism of action may be more
susceptible to developing resistance. In order to prevent herbicide resistance, avoid using the same type of herbicides year after year, and when
possible, use non-herbicide methods of control instead.
|Oral Acute oral LD50 for rats >5000 mg/kg. Skin and eye Acute percutaneous LD50 for rabbits > 5000 mg/kg; very slight, transient irritation. Inhalation LC50 for rats >3.50 mg/l (highest attainable concentration). NOEL For rats 500 mg/kg b.w. daily (maternal), 1000 mg/kg b.w. daily (embryo-foetal). Toxicity class EPA (formulation) III (GR, SC)|
|Mode of action Absorbed via leaves, stems and roots. Symptoms include almost immediate growth inhibition, a chlorotic growing point with necrosis of the terminal bud, resulting in plant death in 2 to 4 weeks. Applied pre-emergence, post-emergence and water-applied. Uses Provides control of Echinochloa spp., as well as many broadleaf, sedge and aquatic weeds in rice. Penoxsulam provides residual weed control, depending on soil type and use rate. In tropical rice, application will be at 10-15 g/ha; in temperate rice, 20-50 g/ha. Primary use will be a post-emergence application in dry-seeded, water-seeded and transplanted rice.|
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