Watershield (Brasenia schreberi)
Water shield is a perennial plant with relatively small, floating oval to elliptical leaves (to 5 inches in diameter) with no slit. Water shield has a distinctive gelatinous slime on the underside of the leaves and coating the stems. Leaves are green above while the underside of leaves and stems are reddish-purple. Stems attach at the center of the leaves. Flowers are small(9 1/2 to 3/4 inch), rise above the surface, are dull-reddish in color and consist of 3 to 4 sepals and petals. Water shield tends to be found in soft, acidic waters and can form large colonies.
WaterShield Control Options
Mechanical/PhysicalWater shield can be cut and the roots can be dug up but physical control is difficult because it can reestablish from seeds or remaining roots.
ChemicalThe active ingredients that have been successful in treating white water lily include glyphosate (G), fluridone (G). E = excellent, G = good
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Products to Control WaterShield
GullWing contains the active ingredient, imazapyr, which inhibits the plant enzyme AHAS (acetohydroxyaced synthase). Habitat is a systemic herbicide that is effective on post-emergent floating and emergent aquatic vegetation. Imazapyr is effective at low-volume rates and does not contain heavy metals, organochlorides or phosphates, making it safe to humans and livestock. GullWing requires the use of a spray adjuvant when applying on post-emergent vegetation.
WhiteCap is a fluridone compound and has been effective on coontail. It is a broad spectrum, systemic herbicide. Systemic herbicides are absorbed and move within the plant to the site of action. Systemic herbicides tend to act more slowly than contact herbicides.
Avocet is a glyphosate formulation that has been effective on water hyacinth. These are broad spectrum, systemic herbicides. Systemic herbicides are absorbed and move within the plant to the site of action. Systemic herbicides tend to act more slowly than contact herbicides. An aquatically registered surfactant (see the label) will have to be added to the glyphosate solution for good results.
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