PASTURE AND RANGELAND (0.2-0.3 OZ/ACRE)

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

PASTURE AND RANGELAND

Application Timing (Pasture grasses)

Metsulfuron Methyl 60 DF may be used on native and improved grasses such as bluestems, grama, bermudagrass, blue grass, orchardgrass, bromegrass, fescue and timothy, as follows:

Minimum time from grass establishment to application

- Bermudagrass: 2 months

- Bluegrass, Bromegrass, and orchardgrass : 6 months

- Timothy: 12 months

- Fescue: 24 months

Fescue Precautions:

Metsulfuron Methyl 60 DF may temporarily stunt fescue, cause it to turn yellow, or cause seedhead suppression. To minimize these symptoms, take the following precautions:

- tank mix with 2,4-D;

- use the lowest recommended rate for target weeds;

- use surfactant at 1/2 to 1 pt per 100 gal of spray solution (1/16 to 1/8% v/v);

- apply late in the spring or after the new growth is 5 to 6 inches tall, or in the fall;

- do not use surfactant when liquid nitrogen is used as a carrier.

The first cutting yields may be reduced due to seedhead suppression resulting from treatment.

Timothy Precautions:

Timothy should be actively growing and at least 6” tall at application. Application under any other conditions may cause crop yellowing and/or stunting. To minimize these symptoms, take the following precautions;

- tank mix with 2,4-D;

- use the lowest recommended rate for target weeds;

- use surfactant at 1/2 pt per 100 gal (1/16% v/v);

- apply in the late summer or fall;

- do not use surfactant when liquid nitrogen is used as a carrier.

Ryegrass Pastures (Italian or perennial): Do not apply Metsulfuron Methyl 60 DF to ryegrass pasture as injury to or loss of the pasture may result.

Other Pastures: Varieties and species of pasture grasses differ in their tolerance to herbicides. When using Metsulfuron Methyl 60 DF on a particular grass for the first time, limit use to one container. If no injury occurs throughout the season, larger acreage may be treated the following season.

Broadleaf pasture species such as alfalfa and clover are highly sensitive to Metsulfuron Methyl 60 DF and will be severely stunted or injured.

WEEDS CONTROLLED

In general, apply when weeds are less than 4” tall or in diameter and are actively growing.

Effectiveness may be reduced if rainfall occurs within 4 hrs after application.

SPECIFIC WEED PROBLEMS

Note: Thorough spray coverage is very important

- Buckbrush and Western Snowberry: Suppression only.

- Musk Thistle: Apply at 2/10 to 3/10 oz per acre in the spring or early summer prior to flowering or in the fall after newly emerged plants have reached the rosette stage of growth. Fall applications should be made before the soil freezes.

- Pensacola bahiagrass control in established Bermudagrass pasture: Apply at 3/10 oz per acre plus surfactant after green-up in the spring but before bahiagrass seedhead formation. Apply when moisture is sufficient to enhance grass growth.

Metsulfuron Methyl 60 DF effectively removes bahiagrass from bermudagrass pastures. In highly infested pastures, Metsulfuron Methyl 60 DF clears the areas of useful forage until the bermudagrass has time to cover the area. Therefore, do not apply to an entire farm or ranch in one year. Treatments should be made to different areas of a farm over a period of years. Pastures may be re-established more quickly by fertilization (particularly with nitrogen and potassium) and/or replanting. Under heavy bahiagrass pressure, grazing pressure, or adverse weather conditions (heat and drought), some regrowth of weeds may occur.

Note: Metsulfuron Methyl 60 DF should not be used for the control of common or Argentine bahiagrass. Metsulfuron Methyl 60 DF should not be applied in liquid fertilizer solutions for Pensacola bahiagrass control, as poor control and/or regrowth may occur.

Restricted Entry Interval

4 hours