Clopyralid

Manufacturer
NUFARM
Category
Herbicides
Registered until
2027-12-31
Registration number
32336
Active materials
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GENERAL INFORMATION
Nufarm Clopyralid Herbicide is a liquid concentrate intended for dilution with water and for use on canola, sugar beets, rutabagas, summerfallow, flax (including low linolenic acid varieties), wheat (spring), barley (spring), oats, strawberry, seedling and established grasses grown for forage and seed production, non- crop farmland, balsam fir Christmas trees and highbush blueberry. It is readily absorbed by both foliage and roots and translocates both upwards and downwards in plants. The product controls Canada thistle, wild buckwheat, scentless chamomile, common groundsel and volunteer alfalfa. It suppresses growth of perennial sow-thistle through control of top growth.

DIRECTIONS FOR USE VEGETATION AND CROP PRECAUTIONS 
Do not use in greenhouses. 
Sensitive Plants 
Do not apply Nufarm Clopyralid Herbicide directly to, or otherwise permit it to come into contact with sunflowers, legumes (such as peas, beans, lentils or alfalfa), fruit or vegetable crops, flowers or other desirable broadleaved plants. Take precautions to prevent spray mists containing it to drift onto them. Residues of Nufarm Clopyralid Herbicide can remain in the soil following the year of use, thereby affecting growth of sensitive crops. Special precautions should be taken during application to non cropland areas such as roadsides, pipelines and railways where sensitive desirable vegetation may be present. Do not apply to or allow drift to come into contact with sensitive desirable vegetation such as vetch or clover which may be found on embankments.
Non-Target Sites 
Avoid contamination of non-target land, water or irrigation ditches. Do not use Nufarm Clopyralid Herbicide in the following areas: standing or flowing water; the inner banks or bottoms of irrigation ditches; in areas where surface water can run off to adjacent croplands either planted or to be planted to sensitive crops. 
Crop Rotation 
Fields previously treated with Nufarm Clopyralid Herbicide can be seeded the following year to wheat, oats, barley, rye (not underseeded with legumes, clover or alfalfa), forage grasses, flax, canola, mustard or it can be summerfallowed. Do not seed to crops other than those listed above in the calendar year followingtreatment. 
Tank Mixtures 
In some cases, tank mixing a pest control product with another pest control product or a fertilizer can result in biological effects that could include, but are not limited to: reduced pest efficacy or increased host crop injury. The user should contact Nufarm Agriculture Inc. at 1-800-868-5444 or www.nufarm.ca for information before mixing any pesticide or fertilizer that is not specifically recommended on this label. The user assumes the risk of losses that result from the use of tank mixes that do not appear on this label or that are not specifically recommended by Nufarm Agriculture Inc. 
Grazing and Harvesting for Feed 
There are no restrictions on the grazing of crops or forages treated with Nufarm Clopyralid Herbicide. If necessary, treated areas may be grazed immediately following application. 
Manure and Straw 
Residues of the herbicide occurring in the straw may be harmful to susceptible plants; therefore, do not use straw or crop residue from treated crops for composting or mulching susceptible broadleaved crops.If the straw or crop residue is used for animal bedding or feed, return the manure to fields to be planted to clopyralid tolerant crops such as wheat, barley, oats, rye, forage grasses, canola or flax. Do not grow susceptible crops such as peas, beans, lentils, potatoes, sunflowers or other sensitive crops on land which has been mulched with straw containing Nufarm Clopyralid Herbicide residues within the last 12 months.

SPRAY EQUIPMENT AND CONTAINER PRECAUTIONS 
Apply only when the potential for drift to areas of human habitation or areas of human activity (such as houses, cottages, schools and recreational areas) is minimal. Take into consideration wind speed, wind direction, temperature inversions, application equipment sprayersettings. 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. 

To Reduce Spray Drift 
Use nozzles that deliver higher volumes and coarser droplets.
Use low pressures (200 to 275 kPa).
Use 100 to 200 L/ha of spray solution.
Spray when the wind velocity is 15 km/hr or less.
Equipment Clean-Up 
Equipment used to apply Nufarm Clopyralid Herbicide should not be used to apply other pesticides to sensitive crops without thorough cleaning. Contact your Nufarm Clopyralid Herbicide dealer for a detailed equipment cleaning procedure.

APPLICATION DIRECTIONS 
Spray Preparation
To prepare the spray solution add about half the desired amount of water to the spray tank, then with mechanical or bypass agitation, add the recommended amount of Nufarm Clopyralid Herbicide. Mix thoroughly in the tank. Second, add the recommended tank-mix herbicide. Finally with continued agitation, add the rest of the water.
Spray Application Volume
Apply Nufarm Clopyralid Herbicide at 0.28 to 0.83 L/ha plus any other herbicide approved as a tank-mix at the recommended rate in sufficient water to ensure thorough coverage (100 to 200 L/ha of spray solution) by ground equipment only at pressures of 200 to 275 kPa. Treat when weeds are young and actively growing, when the Canada thistle is in the rosette to pre-bud stage and before the purple bud stage and volunteer alfalfa is 5-50 cm inheight.

DIRECTIONS FOR USE – Nufarm Clopyralid Herbicide Applied Alone
Weed Stages at Application 
Applications of Nufarm Clopyralid Herbicide should be made when Canada thistle, perennial sow-thistle and scentless chamomile are in the rosette to pre-bud stage of growth. Best results are obtained when Canada thistle is actively growing and soil moisture is adequate for rapid growth. Under dry soil conditions and poor growing conditions, control of Canada thistle may be severely reduced. Applications of Nufarm Clopyralid Herbicide made after the Canada thistle flower has reached the purple bud stage will not provide satisfactory control. 
Control of Canada Thistle 
For in crop control of top growth of Canada thistle apply Nufarm Clopyralid Herbicide at the rate of 0.42 L/ha. This will suppress top growth of Canada thistle for 6 to 8 weeks. Some regrowth may occur by the end of the season but this will not interfere with the harvesting of the crop. For season long control of top growth of Canada thistle apply Nufarm Clopyralid Herbicide at the rate of 0.56 L/ha. This rate will generally provide season long control of Canada thistle. Not all rhizomes will be killed and some regrowth may occur by the end of the growingseason. For season long control of top growth, with a reduction of Canada thistle population in the following year, apply Nufarm Clopyralid Herbicide at the rate of 0.83 L/ha. This rate will provide season long control of Canada thistle and suppression into the following season, resulting in a reduction of the total number of Canada thistle shoots in the treated area. 
Kudzu
In farmland non-crop areas, e.g., storage areas, farm buildings, fence rows, repeat annual applications in a minimum spray volume of 200 L/ha are required to suppress this vine due to regrowth from tubers and crowns and new growth from dormant seed in response to soil disturbance. Repeat annual applications in a minimum of 100 L water/ha may be required in cultivated fields, including summerfallow, where kudzu seed is known to be present. Application may be made by means of a backpack or hand held sprayer for small infestations.

CANOLA (Western Canada Only) 
For use on Polish and Argentine varieties, including canola. Nufarm Clopyralid Herbicide should be diluted with water and applied at the 2 to 6 leaf stage of the crop to effectively control Canada thistle, scentless chamomile, common groundsel, wild buckwheat, the top growth of perennial sow-thistle and volunteer alfalfa. For specific directions for control of Canada thistle only refer to the section: Control of Canada thistle.
SUGAR BEETS 
For Canada thistle control apply Nufarm Clopyralid Herbicide at 0.56 to 0.83 L/ha with ground equipment as a foliar spray either broadcast or in a band over the row. When applied in the band, the amount of Nufarm Clopyralid Herbicide should be reduced proportional to the band width. Nufarm Clopyralid Herbicide should be applied when sugarbeets are in the cotyledon to 8 leaf stage. For the most effective control of Canada thistle, apply Nufarm Clopyralid Herbicide as a broadcast treatment to the entire infested area. Do not apply within 90 days of harvest.
Rutabaga 
For control of common ragweed, apply Nufarm Clopyralid Herbicide with a boom sprayer at the rate of 0.56 L/ha in approximately 200 to 300 L/ha of water. Apply as a postemergent spray when ragweed plants are 5 to 10 cm tall. Application to larger ragweed plants will result in reduced weed control. Make only one application per season. Preharvest interval is 83 days.

BUFFER ZONES 
Uses of the following spray methods or equipment DO NOT require a buffer zone: hand-held or backpack sprayer, and spot treatment. For applications to rights-of-way, buffer zones for protection of sensitive terrestrial habitats are not required; however, the best available application strategies which minimize off-site drift, including meteorological conditions (for example, wind direction, low wind speed) and spray equipment (for example, coarse droplet sizes, minimizing height above canopy), should be used. The buffer zones specified in the table below are required between the point of direct application and the closest downwind edge of sensitive terrestrial habitats (such as grasslands, forested areas, woodlots, hedgerows, riparian areas and shrublands).
For tank mixes, consult the labels of the tank-mix partners and observe the largest (most restrictive) buffer zone of the products involved in the tank mixture and apply using the coarsest spray (ASAE) category indicated on the label for those tank-mix partners.

RESISTANCE MANAGEMENT RECOMMENDATIONS 
For resistance management, Nufarm Clopyralid Herbicide is a Group 4 herbicide. Any weed population may contain or develop plants naturally resistant to Nufarm Clopyralid Herbicide and other Group 4 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 resistancemanagement strategies should be followed.
To delay herbicide resistance:
Where possible, rotate the use of Nufarm Clopyralid Herbicide or other Group 4 herbicides within a growing season (sequence) or among growing seasons 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. To delay resistance, the less resistance-prone partner should control the target weed(s) as effectively as the more resistance-prone partner.
Herbicide use should be based on an integrated weed management program that includes scouting, historical information related to herbicide use and crop rotation, and considers tillage (or other mechanical control methods), cultural (for example, higher crop seeding rates; precision fertilizer application method and timing to favour the crop and not the weeds), biological (weedcompetitive crops or varieties) and other management practices.
Monitor weed populations after herbicide application for signs of resistance development (for example, only one weed species on the herbicide label not controlled). If resistance is suspected, prevent weed seed production in the affected area if possible by an alternative herbicide from a different group. Prevent movement of resistant weed seeds to other fields by cleaning harvesting and tillage equipment when moving between fields, and planting clean seed.
Have suspected resistant weed seeds tested by a qualified laboratory to confirm resistance and identify alternative herbicide options.
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.
For further information or to report suspected resistance, contact Nufarm Agriculture Inc. at 1-800-868-5444 or at www.nufarm.ca.

Registered for culturesRatePreharvest Interval
Canola0.42 - 0.83 l
Sugar beets0.56 - 0.83 l90
Rutabagas0.56 l83
Winter flax0.42 - 0.83 l
Spring flax0.42 - 0.83 l
Spring wheat0.42 - 0.83 l
Spring barley0.42 - 0.83 l
Spring oats0.42 - 0.83 l
Winter oats0.42 - 0.83 l
Blueberries0 l315
Apples0.56 l30
Cabbage0.56 l30
Cauliflower0.56 l30
Broccoli0.56 l30
Kohlrabi0.56 l30
Radishes0.56 l30
Chinese broccoli0.56 l30
Cranberries0 l60
Turnips0.42 - 0.56 l30
Strawberries0.56 - 0.83 l