Broadleaf Weeds

bromoxynil (several trade names)

Rate 0.25 lb ai/a

Time Apply when flax is 2 to 8 inches tall. Do not apply during or after bud stage, or within 75 days of harvest.

Remarks Do not apply with crop oil concentrate, surfactants, or nitrogen solutions.

Caution Temperatures over 85°F within 3 days of application may cause injury. Other situations may also injure flax. To avoid injuring flax, see the "Restrictions and Precautions" section of the label.

Site of action Group 6: photosystem II inhibitor

Chemical family nitrile

bromoxynil + MCPA (several trade names)

Rate 0.22 lb ai/a bromoxynil + 0.22 lb ae/a MCPA

Time Apply when flax is 2 to 8 inches tall. Do not apply during or after bud stage.

Remarks Do not apply with crop oil concentrate, surfactants, or nitrogen solutions.

Caution Temperatures over 85°F within 3 days of application may cause injury. Other situations may also injure flax. To avoid injuring flax, see the "Restrictions and Precautions" section of the label.

Site of action (bromoxynil) Group 6: photosystem II inhibitor; (MCPA) Group 4: synthetic auxin

Chemical family (bromoxynil) Nitrile; (MCPA) Phenoxy acetic acid

clopyralid + MCPA (several trade names)

Rate 0.045 lb ae/a clopyralid + 0.25 lb ae/a MCPA

Time Apply when flax is 2 to 6 inches tall and weeds are actively growing.

Remarks Apply before target weeds reach 3 inches. For control of Canada thistle, apply after the majority of leaves have emerged, but before flax begins bolting.

Caution Make only one application. Do not apply more than 0.25 lb ae/acre of MCPA per year. Preharvest interval is 72 days.

Site of action (both) Group 4: synthetic auxin

Chemical family (clopyralid) Pyridine; (MCPA) Phenoxy acetic acid

MCPA (several trade names)

Rate 0.106 to 0.244 lb ae/a

Time Apply when flax is 2 to 8 inches tall, before early bud stage.

Remarks For Canada thistle control, it may be necessary to apply the high rate, but injury may occur.

Caution Rates and other instructions vary by product label.

Site of action Group 4: synthetic auxin

Chemical family phenoxy acetic acid