How to Get Rid of Witchgrass [Weed Management]

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Shop for Eraser 41% Glyphosate here!
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Shop for Barricade Granular Pre-Emergent Herbicide here!
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Shop for Prodiamine 65 WDG here!
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Witchgrass, also known as panicgrass, tumbleweed grass, or fool hay is a widespread summer annual weed. Once established, this weed is a source of allergens and can cause toxic levels of nitrate in the soil.

Witchgrass gets its name from its hairy stem and large puffy seed head. When mature, this weed can grow to be 1 to 3 feet tall.

In its early stages, witchgrass’s leaves, sheathes, and collar possess dense, green hairs that become a reddish purple as the plant matures.

The leaf blades can grow to be 4 to 10 inches in length and up to three-fifths of an inch wide. Each leaf has a distinct, white midrib.

The inflorescence, or flowering structure, grows in a panicle shape and appears fluffy.

Witchgrass grows well in a variety of different soils, but it grows best in sandy, loamy soil that sees full sunlight throughout the day. It also grows well in areas that get partial sun.

When inspecting for this weed, be on the lookout for grass with hairy stems or puffy seed heads.

Common areas where witchgrass can occur include, but are not limited to, croplands, lawns, ditches, and railroads.

When Witchgrass spreads into areas where no plant should be growing, there are products you can use to eliminate this weed now.

Check out Eraser 41% Glyphosate. This non-selective herbicide will eliminate any plant it is applied to. Just mix 2.5 fluid ounces of Eraser into 1 gallon of water to treat up to 300 square feet. We recommend you mix and apply your solution in a handheld pump sprayer. Be sure to mark this sprayer for Non-Selective Herbicide Use Only to prevent cross-contamination in the future.

Spot-treat any weed you’ve found during your inspection. Use a fan or cone spray pattern to ensure the leaves are fully coated, and spray the weed to the point of wet but not runoff. Be sure to spray on calm days when temperatures are not too hot and when wind speeds are low to minimize drift.

When applied properly, affected weeds will yellow and begin to die. Conduct follow-up applications as necessary. After applying Eraser, you should see results within 2 to 4 days, but a second application may be made after 4 weeks.

If you’re spraying Witchgrass in turf, the surrounding grass may be injured and may need to be seeded.

To prevent new witchgrass from germinating in areas like residential lawns, apply a pre-emergent herbicide like Barricade. Barricade Granular Pre-Emergent Herbicide will form a chemical barrier in your soil that will prevent weed seeds from sprouting and emerging. Depending on your turf grass species, you’ll apply 1.5 to 4 pounds of product per 1,000 square feet. After application, water in the product with at least half an inch of water. Make an application in the fall to stop seeds from germinating in spring. An additional application may be made after 6 months for year-round weed prevention.

For larger areas, use a product like Prodiamine 65 WDG. This is a water dispersible granule that must be mixed with water before application. Like Barricade, this product will also provide pre-emergent control of labeled weeds. We recommend you mix this product with a backpack sprayer or a spray rig. For a general application in turf, evenly distribute 1 pound of product per 1 acre of treatment area. Be sure to use enough water to provide even coverage. In smaller applications, apply 0.4 ounces of product over 1,000 square feet. After application, wait 14-days, then water the treated area with half an inch of irrigation or rainfall.

In addition to pre-emergent herbicides, we also recommend you promote the health of your turf to reduce the conducive conditions that allow weeds and disease to take hold.

Mow your grass at proper intervals to maintain a thick growing density. A lawn dense with taller trimmed grass is better able to choke out weeds and prevent them from establishing.

Reduce the shade cast on your lawn by trimming overgrown shrubbery and tree branches, rake away leaf litter and pick up any debris, and employ a proper watering schedule to provide the local grass with enough water to strengthen its roots, but not so much that will encourage weeds. Many grasses require 1 inch of water every week. Apply the water all at once in the morning so it has time to seep into the ground without evaporating in the sun.


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Click the link to learn more about Witchgrass and shop the professional-grade products featured in this video!
https://bit.ly/witchgrass-control

If you have any questions, call us at (713) 955-2000

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#diypestcontrol #solutionspestandlawn #weedmanagement