Kerb 50 WSPPlant Protection Product ComparisonPlant Protection Product ComparisonReport inaccuraciesReport inaccuracies

GENERAL INFORMATION
Kerb 50 WSP Selective Herbicide is a selective herbicide used to control quackgrass, certain other perennial grasses such as orchardgrass and timothy, and most annual grasses, including wild oats and volunteer wheat. Kerb 50 WSP Selective Herbicide also controls chickweed. Dandelion, thistles and other members of the Compositae family are not controlled by Kerb 50 WSP Selective Herbicide.

GENERAL USE PRECAUTIONS
Effect on soil type: Kerb 50 WSP Selective Herbicide is ineffective and not recommended for application pre-emergence to weeds on highly organic peat or muck soils.
Grazing Restriction: Do not harvest or graze within 90 days after application of 3.25 kg Kerb 50 WSP Selective Herbicide per hectare (7 pouches per Ha) or for 60 days after rates of less than 3.25 kg per hectare (7 pouches per Ha).
The enclosed pouches of Kerb 50 WSP Selective Herbicide are water-soluble. Do not allow pouches to become wet prior to adding to the spray tank. Do not handle the pouches with wet hands or wet gloves. Always reseal overwrap bag to protect remaining unused pouches. Do not remove water-soluble pouches from overwrap except to add directly to the spray tank.

Note that the pouches are water soluble and oil residue in the spray tank will make the pouch insoluble. Do not add pouches to spray solutions containing boron or that may release free chlorine as the plastic in the pouches becomes insoluble.
Caution: Do not use on pastures that contain high proportions of timothy, crested wheat grass or meadow Fescue, as severe stand reduction will occur.

Tank Mixtures
Do not apply this product with any other additive, pesticide or fertilizer except as specifically recommended on this label.

Mixing Instructions:
Add the required number of unopened pouches as determined by the dosage recommendations into the spray tank with agitation. Depending on the water temperature and the degree of agitation, the pouches should dissolve completely within approximately five minutes from the time they are added to the water. Mix Kerb 50 WSP Selective Herbicide in water and apply uniformly with a standard low pressure herbicide sprayer with flat fan nozzles at 300-500 litres of water per hectare.

DIRECTIONS FOR USE
READ ALL DIRECTIONS CAREFULLY BEFORE APPLYING. FAILURE TO FOLLOW LABEL INSTRUCTIONS MAY RESULT IN ERRATIC WEED CONTROL OR CROP DAMAGE.

Rotational crops
Observe a plantback interval of 30 days for leafy vegetables (except Brassica vegetables), 90 days for root and tuber vegetables and 360 days for all other crops.

Field sprayer application
DO NOT apply during periods of dead calm. Avoid application of this product when winds are gusty. DO NOT apply with spray droplets smaller than the American Society of Agricultural Engineers (ASAE) medium classification. Boom height must be 60 cm or less above the crop or ground.

DO NOT apply by air.
Reduce dosage accordingly for band treatment.

Methods of Application
Kerb 50 WSP Selective Herbicide can be either fall or spring applied depending upon the crop involved.

A) Fall application (Alfalfa, Trefoil)
Kerb 50 WSP Selective Herbicide should be applied in the fall from late September to early November. Exact timing depends on soil temperature and ground freezing. Best results are obtained when soil temperature is low but above freezing and soil moisture is high. Surface applications are most effective if followed by rain in a day or two or a light overhead irrigation (1.25 to 2.50 cm). KERB 50 WSP Selective Herbicide acts through root absorption.

Established Pastures:
To control foxtail barley (Hordeum jubatum) in established grass pastures, or grass/legume (alfalfa, trefoil) pastures, apply Kerb 50 WSP Selective Herbicide in late fall prior to freezeup. On brown, dark brown, or gray wooded soils use 0.9 kg of Kerb 50 WSP Selective Herbicide per hectare (2 pouches/ha). On thin black or black soils use 1.12 kg of Kerb 50 WSP Selective Herbicide per hectare (2.5 pouches/ha). Some of the less tolerant pasture grass species, (e.g. tall fescue, creeping red fescue) may experience a 10-15% reduction as a result of the treatment.

B) Spring Application (Seed Alfalfa):
Kerb 50 WSP Selective Herbicide can be applied in the spring as a surface spray to control annual grasses, including wild oats. For optimum control the soil temperature should be cool. If soil temperature is high and moisture content low a light incorporation is recommended.

Dodder Control in Alfalfa and Trefoil grown for seed
3.2 kg Kerb 50 WSP Selective Herbicide per hectare (7 pouches per Ha). Apply in the fall (late September to early November) or early spring (early April to early May); spring application will be effective ONLY if low temperatures prevail and moisture is available following application. Spot treatment of Dodder may be necessary as complete control of Dodder is not achieved with Kerb 50 WSP Selective Herbicide.

STRAWBERRIES (Maritimes and British Columbia only)
To control annual grasses and chickweed, apply Kerb 50 WSP Selective Herbicide from late September to early November at a rate of 2.25 kg per hectare (5 pouches per ha). Best results are obtained when soil temperatures are low but above freezing and when soil moisture is high.

APPLES AND PEARS
To control quackgrass and annual grasses apply Kerb 50 WSP Selective Herbicide from late September to early November at a rate of 4.5 kg product per hectare (10 pouches per ha) or 45 g per 100 square metres (1000 square metres per pouch). Use only under trees established for at least one year. Best results are obtained when soil temperatures are low but above freezing and when soil moisture is high.

LOWBUSH BLUEBERRIES
To control perennial grasses including quackgrass and annual grasses, apply Kerb 50 WSP Selective Herbicide from late September to early November at rates of 3.25-4.50 kg product per hectare (7-10 pouches per ha). Best results are obtained when soil temperatures are low but above freezing and when soil moisture is high.

Note: Do not apply Kerb 50 WSP Selective Herbicide to the above crops until all the fruits have been harvested.

LETTUCE (Direct seeded or transplanted)
To control germinating annual grasses and some broadleaf weeds, apply Kerb 50 WSP Selective Herbicide once a year at 2.2 kg product per hectare (5 pouches per ha). For direct seeded lettuce apply either as preplant incorporation, preemergent or postemergent with a pre-harvest interval of 55 days. For transplanted lettuce apply Kerb 50 WSP Selective Herbicide 7-10 days post-transplant.

Note: Do not replant lettuce in the Kerb 50 WSP Selective Herbicide treated field in the same year as significant residues may result.

BUFFER ZONES TO PROTECT NON-TARGET SENSITIVE TERRESTRIAL HABITATS
The buffer zones specified in the table below are required between the point of direct application and the closest downwind edge of non-target sensitive terrestrial habitats (such as grasslands, forested areas, shelter belts, woodlots, hedgerows, riparian areas and shrublands).

RESISTANCE MANAGEMENT RECOMMENDATIONS
For resistance management, Kerb 50 WSP Selective Herbicide is a Group 15 herbicide. Any weed population may contain or develop plants naturally resistant to Kerb 50 WSP Selective Herbicide and other Group 15 herbicides. The resistant biotypes may dominate the weed population if these herbicides are used repeatedly in the same field. Other resistance mechanisms that are not linked to site of action, but specific for individual chemicals, such as enhanced metabolism, may also exist. Appropriate resistance-management strategies should be followed.
To delay herbicide resistance:
Where possible, rotate the use of Kerb 50 WSP Selective Herbicide or other Group 15 herbicides with different herbicide groups that control the same weeds in a field.
Use tank mixtures with herbicides from a different group when such use is permitted.
Herbicide use should be based on an IPM program that includes scouting, historical information related to herbicide use and crop rotation, and considers tillage (or other mechanical), cultural, biological and other chemical control practices.
Monitor treated weed populations for resistance development.
Prevent movement of resistant weed seeds to other fields by cleaning harvesting and tillage equipment and planting clean seed.
Contact your local extension specialist or certified crop advisors for any additional pesticide resistance-management and/or integrated weed-management recommendations for specific crops and weed biotypes.

NOTICE TO USER: This pest control product is to be used only in accordance with the directions on the label. It is an offence under the Pest Control Products Act to use this product in any way that is inconsistent with the directions on the label. The user assumes the risk to persons or property that arises from any such use of this product.