clodinafop (Discover NG and other trade names)
Rate 0.05 to 0.063 lb ai/A (12.8 to 16 oz/A Discover NG)
Time Apply to winter wheat from the two-leaf to pre-boot stage. Do not apply to winter wheat in the fall. Apply to wild oat from one- to six-leaf stage but before fourth tiller emerges. Apply to Italian ryegrass from one- to five-leaf stage but before tillering.
Remarks Wheat is more susceptible to injury when temperatures 48 hr before or after application are below 40°F. See label for crop rotation restrictions.
Caution Apply only once per season. Do not graze or feed forage from treated area for at least 30 days after application. Preharvest interval is 60 days. Do not apply to a crop stressed by conditions such as frost, low fertility, drought, flooding, or disease or insect damage, because crop may be injured.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
flucarbazone (Pre-Pare and other trade names)
Rate 0.0088 to 0.013 lb ai/A (0.2 to 0.3 oz/A Pre-Pare)
Time Apply at burndown (preplant or pre-emergence to the crop), preferably with an herbicide containing glyphosate.
Remarks Residual performance may be reduced if applied more than 10 days prior to seeding or if activating rainfall is not received within 10 days of application.
Caution Apply on soils with organic matter greater than 1.0% and pH less than 8.0.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylaminocarbonyltriazolinone
flucarbazone (Everest 3.0 and other trade names)
Rate 0.027 lb ai/A (2.0 oz/A Everest 3.0)
Time Apply to winter wheat from wheat emergence to 60 days prior to harvest. For Italian ryegrass and wild oat, application timing is from one-leaf to two-tiller stage. See label for application timing, weed size, and adjuvant use rate.
Remarks Do not graze livestock or harvest forage for hay from treated areas for a minimum of 30 days following application. Do not apply more than once per growing season. Mix with a nonionic surfactant at 2 quarts/100 gal. May be applied by air. Follow adjuvant recommendation on the label.
Caution Preharvest interval is 60 days. Certain crops (mustards) cannot be replanted within 4 to 24 months of treatment; see label for crop rotation restrictions.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylaminocarbonyltriazolinone
mesosulfuron (Osprey)
Rate 0.009 to 0.013 lb ai/A (3.2 to 4.75 oz/A Osprey)
Time Apply to winter wheat from wheat emergence to the two-node stage. For Italian ryegrass and wild oat, apply from one-leaf to two-tiller growth stage. See label for application timing and weed size.
Remarks Use the 4.75 oz/A rate for Italian ryegrass control. Treat heavy infestations before they compete with the crop. A recommended adjuvant must be tank mixed with Osprey as specified on the label. Do not apply Osprey more than once per crop year.
Caution For winter wheat only.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
mesosulfuron + thiencarbazone (Osprey XTRA)
Rate 0.013 to 0.018 lb ai/A (3.2 to 4.75 oz/A Osprey XTRA)
Time Apply to winter wheat from wheat emergence to the two-node stage. Apply from one-leaf to two-tiller growth stage. See label for application timing and weed size.
Remarks Use the 4.75 oz/A rate except 3.2 oz/A may be used for wild oat. Treat heavy infestations of grassy weeds before they compete with the crop. Use only a non-ionic surfactant and a nitrogen source for adjuvants. Do not apply Osprey XTRA more than once per crop year.
Caution For winter wheat only.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea