glyphosate (Rodeo and others)
Rate 2 to 3.75 lb ae/A broadcast, 2% to 5% solution through hand-held equipment, or 33% solution with wiper applicators
Time Apply to actively growing cordgrass any time from late June until first killing frost.
Remarks Treat at least 6 hr before tidewater will cover plants. Debris and silt on cordgrass reduce performance. It may be necessary to wash plants before application. Add approved nonionic surfactant at 1 to 2 quarts/100 gal spray mix or 10% by volume with wiper applicators.
Caution With hand-held equipment, do not spray to point of runoff.
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted
imazapyr (Habitat and others)
Rate 1 to 1.5 lb ae/A
Time Apply to actively growing cordgrass, usually mid-June until killing frost.
Remarks Add suitable adjuvant to spray solution.
Caution Do not apply in the root zone of desirable trees. Treated water cannot be used for irrigation for 120 days.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Imidazolinone