Liquid iron for grass9/25/2023 It is suggested that an application not be made before heavy rainfall incidences. Not all weeds have been tested to determine if the iron is effective at various rates. The FeHEDTA label application rate is dependent upon the weed to be controlled. This FeHEDTA is labeled for lawns, turf (right of way/non-crop areas), golf courses, parks, playgrounds, cemeteries, and athletic fields, patios, driveways, sidewalks and flower beds. Labels have precautions against use on bentgrass species. Testing needs to be conducted on warm season grasses such as Bermuda and zoysia. Limited tests at the University of Maryland turfgrass plots have been conducted on these cool season species of turfgrass and found to cause no detectable long-term impact on the health of the turfgrass after one year of application. Most iron materials have been tested on turf-type tall fescues, perennial ryegrass and bluegrass species. Medium and higher rates are more likely to cause discoloration of cool season turfgrass. Labels on commercially available products suggest low, medium and high rates for controlling or suppressing specific weeds. However, the grass will generally recover within a few days to a week. A darkening of turfgrass leaf blades can occur after treatment. Treatments should be reapplied 4 weeks after the first application for long-term control with up to four applications per year. Iron oxidation causes plant necrosis causing the weed to quickly dry up, turn black, shrivel, and die within hours of application.įeHEDTA is applied to actively growing small weeds in lawns in the spring or in the fall when temperatures are cool, and there is ample moisture. Since broadleaf weeds absorb FeHEDTA more easily and in higher quantities than turf, weeds are impacted almost instantly while the turf remains unharmed. A 26.5% FeHEDTA product is 4.43% actual iron. HEDTA or (hydroxyethylenediaminetriacetic acid) that keeps it soluble and readily available for plant uptake, causing iron oxidation. This form of iron (Fe) is bound to a chelating agent (e.g. Fundamentally, these iron (Fe) products are similar to liquid products that treat micronutrient deficiencies in plants and are considered mineral based materials. These selective, broadleaf herbicides contain the active ingredient chelated iron. Demand will likely result in additional iron-based herbicides being brought onto the market. Currently, there are approximately five iron-based commercial products registered by the EPA's Biopesticide Division and labeled for broadleaf weed control. Few alternatives exist to using the chemical herbicide 2,4-D and its allies to reduce broadleaf weeds in turfgrass or glyphosphate in landscapes. Some broadleaf weeds in a lawn or landscape may be considered undesirable or competitive to desired species of turfgrass or plants we want to grow. Iron-based Herbicides: Alternative Materials for Weed Control in Landscapes and Lawns
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