2,4-D ester
Rate 6 lb ae per 100 gal of spray solution for spot treatments. Add crop oil, diesel oil, or surfactant to increase wetting.
Time Apply before cattail heads appear in spring.
Remarks Foliage must be thoroughly wet. 2,4-D does not control as well as glyphosate but is less expensive. 2,4-D must be reapplied to give satisfactory control.
Caution Avoid drift to sensitive crops.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid
glyphosate
Rate 3 lb ae/A
Time Apply to mature cattails after heads are formed and before frost.
Remarks Allow 7 days or longer before clipping or tillage operations. Use additional surfactant.
Caution Glyphosate controls grasses as well as other vegetation in treated areas.
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted
imazapyr (Habitat)
Rate 0.5 to 1 lb ae/A
Time Apply after cattail head appears in the boot or after head emerges and before 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