Wild Oat

fenoxaprop (various trade names)

Rate 0.0825 lb ai/a fenoxaprop (10.6 oz/a of 1EC)

Time Apply from barley emergence up to the five-leaf stage but before the jointing stage, and when grass weeds are in the one-leaf (fully expanded) to advanced tillering stage. Windgrass will be controlled from emergence to 3 inches tall.

Remarks Use 5.3 fl oz/a for green foxtail, 6.4 fl oz/a for yellow foxtail and wild proso millet, and 10.6 fl oz/a for barnyardgrass, black-grass, windgrass, green foxtail and wild oat control. Low soil moisture, low humidity and temperatures above 85°F several days prior, during or following application may reduce foxtail and wild oat control. Under cool, wet conditions, further crop safety can be obtained by tank mixing MCPA ester at recommended rates. In dense weed populations, a 15 to 20 gal/a spray volume is required for best control. Restricted entry interval (REI) is 24 hr.

Caution Always check the tank-mix partner label to determine if the addition of a surfactant is required. Do not tank mix with dicamba or 2,4-D; see label for herbicides approved for tank mixing. Do not apply if conditions might move spray from target area. Do not apply within 57 days of harvesting barley. Do not apply through any irrigation system. Rain or sprinkler irrigation within 1 hour after application may reduce wild oat control.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Aryloxyphenoxy propionate

triallate (Far-Go or Avadex)

Rate 1.25 to 1.5 lb ai/a (1.25 to 1.5 quart/a Far-Go or 12.5 to 15 lb/a Avadex)

Time Apply preplant or postplant, and incorporate.

Remarks For proper incorporation, set incorporation implement to work the soil no deeper than 3 to 4 inches. Incorporation should be performed immediately after application. See Avadex label for more specific incorporation instructions. Do not use disk implements for incorporation. Some stand thinning may occur on clay knobs or where wheat is dusted in, due to dry weather. Application to a field that is wet, lumpy, rough, or ridged will result in reduced wild oat control and crop thinning. If applied post-planting, cultivate with a flex multiweeder or harrow, and follow with a second incorporation at right angles, adjusting incorporation depth so seeds are not disturbed. Do not graze treated areas. Do not apply on barley underseeded to legumes. Some stand thinning may occur on clay knobs or where wheat is dusted in, due to dry weather. Restricted entry interval (REI) is 12 hr.

Caution Only one application per growing season and must not exceed 1.5 qts/a of Far-Go or 15 lbs/a of Avadex.

Site of action Group 8: lipid synthesis inhibitor but not an ACCase inhibitor

Chemical family Thiocarbamate

triallate (Avadex) followed by diuron (Karmex or Direx)

Rate 1.25 lb ai/a triallate (12.5 lb/a Avadex) followed by 1.2 to 1.6 lb ai/a diuron (1.5 to 2 lb/a of 80% DF)

Time Apply triallate before or after seeding, and incorporate immediately, no deeper than 3 to 4 inches; do not use disk implements for incorporation. Apply diuron preemergence after rain settles soil.

Remarks Use diuron only in drill-planted winter barley, in western Oregon and western Washington. Triallate is not effective against broadleaf weeds. Do not graze treated areas or replant diuron-treated area to any crop for 1 year. Restricted entry interval (REI) is 12 hr for triallate and diuron.

Site of action (triallate) Group 8: lipid synthesis inhibitor; (diuron) Group 7: photosystem II inhibitor

Chemical family (triallate) thiocarbamate; (diuron) substituted urea