chlorsulfuron (Telar)
Rate 0.75 oz ai/A (1 oz/A of the 75% Telar)
Time Apply early postemergence to actively growing plants.
Remarks Using a nonionic surfactant increases effectiveness.
Caution Apply only to pasture, range, Conservation Reserve Program (CRP), and non-crop sites.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
flazasulfuron (Mission)
Rate 0.033 to 0.045 lb ai/A (2.14 to 2.85 oz/A Mission)
Time Pre- and postemergence. Apply to plants less than 4 inches tall.
Remarks Must be activated with 0.25 to 0.5 inch of water for preemergence control. Preemergence efficacy is best when applied to bare soil. Do not disturb the soil after activation. Use an adjuvant for postemergent applications.
Caution A 25-foot buffer must be maintained between the point of direct application and the closest downwind edge of sensitive terrestrial habitats (forested areas, riparian areas), freshwater habitats (lakes, rivers, sloughs), and estuarine/marine habitats.
Site of action Group 2: inhibition of the enzyme acetolactate synthase
Chemical family Sulfonylurea
MCPA
Rate 1 lb ae/A
Time Apply in spring or fall when wild carrot is actively growing but before bolting.
Remarks Seedlings are easier to control than older plants. Treat annually to control seedlings.
Caution Avoid spray drift to sensitive crops.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid
metsulfuron (Ally and others)
Rate Ally: 0.12 to 0.18 oz ai/A (0.2 to 0.3 oz/A)
Time Apply early postemergence to actively growing plants.
Remarks Using a nonionic or silicone surfactant increases effectiveness.
Caution Consult labels for crops on which each product can be used.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea