DURUM AND WAMPUN VARIETY SPRING WHEAT - SUPPRESSION OF WEEDS

General Information

GENERAL INFORMATION

Metsulfuron Methyl 60 DF is recommended for use on land primarily dedicated to the production of wheat, barley, fallow, pasture, and rangeland.

Metsulfuron Methyl 60 DF can be used in most states. Check with your state before use.

Metsulfuron Methyl 60 DF is not registered for use in Alamosa, Conejos, Costilla, RioGrande, and Saquache counties of Colorado.

Metsulfuron Methyl 60 DF controls weeds in wheat (including durum), barley, pasture, rangeland grasses, and fallow. Metsulfuron Methyl 60 DF is mixed in water or can be preslurried in water and added to liquid nitrogen carrier solutions and applied as a broadcast spray. A surfactant should be used in the spray mix unless otherwise specified on the label.

Metsulfuron Methyl 60 DF is noncorrosive, nonflammable, nonvolatile, and does not freeze.

Metsulfuron Methyl 60 DF controls weeds by postemergence activity. For best results, apply Metsulfuron Methyl 60 DF to young, actively growing weeds. The use rate depends upon the weed spectrum and size of weeds at application. The degree and duration of control may depend on the following factors:

- type and number of weeds

- weed size

- environmental conditions during and after treatment

Surfactants

Unless otherwise specified, add a recommended nonionic surfactant having at least 80% active ingredient at 1 to 2 qt per 100 gal of spray solution (0.25 to 0.5% v/v).

Surfactant Rate Exceptions: (1) On all spring wheat and spring or winter barley use 1/2 to 1 qt per 100 gals; (2) on Fescue pastures use 1/4 to 1/2 qt per 100 gals; (3) on Timothy pastures use 1/4 qt per 100 gals.

Consult your agricultural dealer, applicator, or extension agent for a listing of approved surfactants.

Antifoaming agent may be used if needed.

Do not use low rates of liquid fertilizer as a substitute for surfactant.

Ground Application

For optimum spray coverage, use flat-fan or low volume flood nozzles.

For flood nozzles on 30” spacing, use at least 10 gallons spray solution per acre (GPA), nozzles no larger than TK 10 (or equivalent), and at least 30 pounds per square inch (psi). For 40” nozzle spacing, use at least 13 GPA; for 60” spacing, use at least 20 GPA. Overlap nozzles 100% for all spacings.

With Raindrop RA nozzles, use at least 30 GPA and ensure that nozzle spray patterns overlap 100%.

For flat-fan nozzles, use at least 3 GPA for applications to wheat or barley. Use at least 10 GPA for applications to pasture or rangeland. Use 50-mesh screens or larger.

Aerial Application

Use nozzle types and arrangements that provide optimum spray distribution and maximum coverage.

Wheat Barley and Fallow – use 1 to 5 GPA. Use at least 3 GPA in Idaho, Oregon, or Utah.

Pasture and Rangeland – use 2 to 5 GPA.

When applying Metsulfuron Methyl 60 DF by air in areas adjacent to sensitive crops, use solid stream nozzles oriented straight back. Adjust the swath to avoid spray drift damage to sensitive crops downwind and/or use ground equipment to treat the border edge of fields. See the Spray Drift Management section of the label.

PRECAUTIONS

Injury to or loss of desirable trees or vegetation may result from failure to observe the following:

-Do not apply, drain, or flush equipment on or near desirable trees or other plants, or on areas where their roots may extend, or in locations where the chemical may be washed or moved into contact with their roots.

-Do not use on lawns, walks, driveways, tennis courts, golf courses, athletic fields, commercial sod operations, or other high-maintenance, fine turfgrass areas, or similar areas.

-Do not use on grasses grown for seed.

Do not apply to irrigated land where tailwater will be used to irrigate crops other than wheat and barley.

Do not apply to frozen ground as surface runoff may occur.

Do not apply to snow-covered ground.

Wheat and barley varieties may differ in their response to various herbicides. Consult your state experiment station, university, or extension agent as to sensitivity to any herbicide. If no information is available, limit the initial use of Metsulfuron Methyl 60 DF to a small area.

Under certain conditions such as heavy rainfall, prolonged cold weather, or wide fluctuations in day/night temperatures prior to or soon after application, temporary discoloration and/or crop injury may occur.

Do not apply to wheat or barley that is stressed by severe weather conditions, drought, low fertility, water-saturated soil, disease, or insect damage, as crop injury may result. Risk of injury is greatest when crop is in the 2 to 5-leaf stage. Severe winter stress, drought, disease, or insect damage following application also may result in crop injury.

The combined effects of Metsulfuron Methyl 60 DF postemergence applied following use of preemergence wild oat herbicides may cause crop injury to spring wheat when crop stress (soil crusting, planting too deep, prolonged cold weather, or drought) causes poor seedling vigor.

In the Pacific Northwest, to prevent cold weather-related crop injury, avoid making applications during winter months when weather conditions are unpredictable and can be severe.

Do not apply to wheat, barley or pastures undersown with legumes, as injury to the forage may result.

To reduce the potential for movement of treated soil due to wind erosion, do not apply to powdery dry or light sandy soils until they have been stabilized by rainfall, trashy mulch, reduced tillage, or other cultural practices. Injury to immediately adjacent crops may occur when treated soil is blown onto land used to produce crops other than cereal grains or pasture/rangeland.

For ground applications applied to weeds when dry, dusty field conditions exist, control of weeds in wheel track areas may be reduced. The addition of 2,4-D or MCPA should improve weed control under these conditions.

Preplant or preemergence applications of 2,4-D or herbicides containing 2,4-D made within 2 weeks of planting spring cereals may cause crop injury when used in conjunction with early postemergence applications of Metsulfuron Methyl 60 DF. For increased crop safety, delay treatment with Metsulfuron Methyl 60 DF until crop tillering has begun.

Limitations, Restrictions, and Exceptions

DURUM AND WAMPUN VARIETY SPRING WHEAT

Application Timing

Apply after the crop is tillering but before boot. For durum and wampum varieties, use in combination with 2,4-D.

Do not apply during boot or early heading, as crop injury may result.

SPECIFIC WEED PROBLEMS

Note: Thorough spray coverage is very important

- Canada Thistle and Sowthistle: Apply Metsulfuron Methyl 60 DF with a surfactant, 2,4-D or MCPA in the spring after the majority of thistles have emerged while still small (rosette stage to 6” elongating stems) and actively growing to reduce the ability of emerged thistles to compete with the crop.

- Corn Gromwell and Prostrate Knotweed: Apply Metsulfuron Methyl 60 DF with a surfactant when weeds are actively growing, are no larger than 2” tall, and when crop canopy will allow thorough coverage. Tank mixing with 2,4-D or MCPA can improve results.

- Sunflower (common/volunteer): Apply with a surfactant, 2,4-D or MCPA after the majority of sunflowers have emerged, are 2” to 4” tall and are actively growing. Use spray volumes of at least 3 gal/ac by air or 5 gal/ac by ground (10 gal/ac by ground in pastures).

- Wild Buckwheat: For best results, apply in a tank mix with MCPA when plants have no more than 3 true leaves (not counting the cotyledons). If plants are not actively growing, delay treatment until environmental conditions favor active weed growth.

Restricted Entry Interval

4 hours