GRASS SEED PRODUCTION - PERENNIAL WEEDS
(How this product works)
Durango herbicide is a postemergence, systemic herbicide with no soil residual activity and is intended for control of annual and perennial weeds and woody plants in various cropping systems, fallow cropland and CRP acres, and farmsteads. Durango is generally non-selective and gives broad-spectrum control of many annual weeds, perennial weeds, woody brush and trees. It is formulated as a water-soluble liquid. It may be applied through most standard industrial or field-type sprayers after dilution and thorough mixing with water or other carriers according to label instructions.
Although not generally required, surfactant may be added to spray solutions if water or fertilizer carrier volume is greater than 30 gallons per acre, the application rate for Durango is less than 15 fl oz per acre, or additional surfactant is desired for burndown applications.
Nonionic surfactants that are labeled for use with herbicides may be used. Do not reduce rates of this product when adding surfactant.
When using additional surfactant, a surfactant concentration of 0.125 to 0.25 percent (1 to 2 pints per 100 gallons of spray solution) is recommended for surfactants containing 70 percent or more active ingredient. Read and follow the precautionary statements and applicable use directions on the label of the surfactant product.
When applied as recommended and under the conditions described, this product controls annual and perennial weeds listed in the label booklet.
Do not add buffering agents or pH adjusting agents to the spray solution when Durango is the only pesticide being applied. The use of additional surfactant with this product for applications over the-top of crops containing the Roundup Ready gene is not recommended unless required by a tank mix partner. Do not use additional surfactant with this product for preharvest to cotton applications.
Time to Symptoms: The active ingredient in Durango moves through the plant from the point of foliage contact to and into the root system. Visible effects on most annual weeds occur within 2 to 4 days, but on most perennial weeds may not occur for 7 days or more. Extremely cool or cloudy weather following treatment may slow activity of Durango and delay development of visual symptoms. Visible effects are a gradual wilting and yellowing of the plant that advances to complete browning of above ground growth and deterioration of underground plant parts.
Stage of Weeds: Annual weeds are easiest to control when they are small. Best control of most perennial weeds is obtained when treatment is made at late growth stages approaching maturity. Refer to the annual, perennial, woody brush and trees rate tables for recommendations for specific weeds.
Always use the higher rate of Durango per acre within the recommended range when weed growth is heavy or dense or weeds are growing in an undisturbed (non-cultivated) area.
Do not treat weeds under poor growing conditions such as drought stress, disease or insect damage, as reduced weed control may result. Reduced herbicidal activity may also occur when treating weeds heavily covered with dust.
Cultural Considerations: Reduced control may result when applications are made to annual or perennial weeds that have been mowed, grazed, or cut, and have not been allowed to regrow to the recommended stage for treatment.
Rainfastness: Heavy rainfall soon after application may wash Durango off of the foliage and a repeat application may be required for adequate control.
Spray Coverage: For best results, spray coverage should be uniform and complete. Do not spray weed foliage to the point of runoff.
Mode of Action: The active ingredient in Durango inhibits an enzyme found only in plants and microorganisms that is essential to formation of specific amino acids.
No Soil Activity: Weeds must be emerged at the time of application to be controlled by Durango. Weeds germinating from seed after application will not be controlled. Unemerged plants arising from unattached underground rhizomes or rootstocks of perennials will not be affected by the herbicide and will continue to grow.
Biological Degradation: Degradation of Durango is primarily a biological process carried out by soil microbes.
Annual Maximum Use Rate: Except as otherwise specified in a crop section of the label, the combined total of all treatments must not exceed 6 quarts of Durango per acre per year. The maximum use rates stated throughout this product's labeling apply to this product combined with the use of all other herbicides containing glyphosate or sulfosate as the active ingredient, whether applied as mixtures or separately. Calculate the application rates and ensure that the total use of this and other glyphosate or sulfosate containing products does not exceed stated use rate.
For noncrop uses, the combined total of all treatments must not exceed 8 quarts of Durango per acre per year.
Weed Resistance Management
Glyphosate, the active ingredient in this product, is a group 9 herbicide (inhibitor of EPSP synthase). Some naturally occurring weed biotypes that are tolerant (resistant) to glyphosate may exist due to genetic variability in a weed population. Where resistant biotypes exist, the repeated use of herbicides with the same mode of action can lead to the selection for resistant weeds. Certain agronomic practices reduce the likelihood that resistant weed populations will develop, and can be utilized to manage weed resistance once it occurs.
- In burndown programs, always tank mix glyphosate with 2,4-D and/or other non-glyphosate herbicide. This product may be tank mixed with the products listed provided the product tank-mixed is registered for use on this site.
- Use soil-applied herbicides at full or reduced rates on some or all of your Roundup Ready crop fields to provide early season weed control, allow for optimal postemergence applications of glyphosate and to interrupt or delay selection for glyphosate resistant weeds.
Because the presence of glyphosate-resistance in weed populations is difficult to detect prior to use, Dow AgroSciences accepts no liability for any losses that may result from the failure of Durango to control glyphosate-resistant weeds.
Avoid contact of herbicide with foliage, green stems, exposed non-woody roots or fruit of crops, desirable plants and trees, because severe injury or destruction may result.
NOTE: Use of Durango in any manner not consistent with the label may result in injury to persons, animals or crops, or other unintended consequences. Keep container closed to prevent spills and contamination.
Application-Applications should not be made at a height greater than 10 feet above the top of the largest plants unless a greater height is required for aircraft safety. Making applications at the lowest height that is safe reduces exposure of droplets to evaporation and wind.
Mixing with Water
Durango mixes readily with water. Mix spray solutions of Durango as follows: Fill the mixing or spray tank with the required amount of water.
Add the recommended amount of Durango near the end of the filling process and mix well. Use caution to avoid siphoning back into the carrier source. Use approved anti-back-siphoning devices where required by state or local regulations. During mixing and application, foaming of the spray solution may occur. To prevent or minimize foam, avoid the use of mechanical agitators, terminate by-pass and return lines at the bottom of the tank and, if needed, use an approved anti-foam or defoaming agent.
Application Equipment and Techniques
Do not apply Durango through any type of irrigation system.
Durango may be applied with the following application equipment:
Aerial: Fixed Wing and Helicopter
Ground Broadcast Spray: Boom or boomless systems, pull-type sprayer, floaters, pick-up sprayers, spray coupes and other ground broadcast equipment.
Hand-Held and High-Volume Spray Equipment: Knapsack and backpack sprayers, pump-up pressure sprayers, handguns, hand wands, mistblowers1, lances and other hand-held and motorized spray equipment used to direct the spray onto weed foliage.
1Durango is not registered in California or Arizona for use in mistblowers.
Selective Equipment: Recirculating sprayers, shielded and hooded sprayers, wiper applicators and sponge bars.
Injection Systems: Aerial or ground injection sprayers.
Controlled Droplet Applicator (CDA): Hand-held or boom-mounted applicators that produce a spray consisting of a narrow range of droplet sizes.
Apply these spray solutions in properly maintained and calibrated equipment capable of delivering desired volumes.
Cut Stump Application: Apply using suitable equipment to ensure coverage of the entire cambium of cut stems.
Do not apply Durango using aerial spray equipment except under conditions as specified within the label.
Use the recommended rates of this herbicide in 3 to 15 gallons of water per acre unless otherwise specified on the label. Unless otherwise specified, do not exceed 24 fluid ounces per acre. Aerial applications of Durango may be made in annual cropping conventional tillage systems, fallow and reduced tillage systems and preharvest applications. Refer to the individual use area sections of the label for recommended volumes and application rates.
For aerial application in California or Arkansas, refer to the federal supplemental label for aerial applications in that state for specific instructions, restrictions and requirements. Tank mixtures of Durango plus dicamba herbicide may not be applied by air in California.
Avoid direct application to any body of water.
Ground Broadcast Equipment
Use the recommended rates of Durango in 3 to 40 gallons of water per acre as a broadcast spray unless otherwise specified. As density of weeds increases, spray volume should be increased within the recommended range to ensure complete coverage. Carefully select proper nozzles to avoid spraying a fine mist. For best results with ground application equipment, use flat fan nozzles. Check for even distribution of spray droplets.
Hand-Held and High-Volume Equipment
Apply to foliage of vegetation to be controlled. For applications made on a spray-to-wet basis, spray coverage should be uniform and complete.
Do not spray to the point of runoff. Use coarse sprays only. Refer to the “Mixing for Hand-held Sprayers” section of the label for instructions on preparing spray solutions of a certain percentage content.
For control of weeds listed in the annual weeds rate table, apply a 0.5 percent solution of Durango to weeds less than 6 inches in height or runner length. Apply prior to seedhead formation in grass or bud formation in broadleaf weeds. For annual weeds over 6 inches tall, or unless otherwise specified, use a 1 percent solution.
For best results, use a 1.5 percent solution on harder-to-control perennials, such as bermudagrass, dock, field bindweed, hemp dogbane, milkweed and Canada thistle.
When using application methods that result in less than complete coverage, use a 3.75 percent solution for annual and perennial weeds and a 3.75 to 5 percent solution for woody brush and trees.
Durango may be applied through recirculating spray systems, shielded applicators, hooded sprayers, wiper applicators or sponge bars after dilution and thorough mixing with water to listed weeds growing in any noncrop site specified on the label and only when specifically recommended in cropping systems.
A recirculating spray system directs the spray solution onto weeds growing above desirable vegetation, while spray solution not intercepted by weeds is collected and returned to the spray tank for reuse.
A shielded or hooded applicator directs the herbicide solution onto weeds, while shielding desirable vegetation from the herbicide.
A wiper or sponge applicator applies the herbicide solution onto weeds by rubbing the weed with an absorbent material containing the herbicide solution.
Applications made above the crops should be made when the weeds are a minimum of 6 inches above the desirable vegetation. Better results may be obtained when more of the weed is exposed to the herbicide solution. Weeds not contacted by the herbicide solution will not be affected. This may occur in dense clumps, severe infestations or when the height of the weeds varies so that not all weeds are contacted. In these instances, repeat treatment may be necessary.
Shielded and hooded applicators
Use nozzles that provide uniform coverage within the treated area.
Keep shields on these sprayers adjusted to protect desirable vegetation.
Extreme care must be exercised to avoid contact of herbicide with desirable vegetation.
A hooded sprayer is a type of shielded applicator. The spray pattern is completely enclosed on the top and all sides by a hood, thereby shielding the crop from the spray solution. This equipment must be set up and operated in a manner that avoids bouncing or raising the hoods off the ground in any way. If the hoods are raised, spray particles may escape and come into contact with the crop, causing damage or destruction of the crop. The spray hoods must be operated on the ground or skimming across the ground. Speed of operation must be adjusted to avoid bouncing of the spray hoods. Avoid operation on rough or sloping ground where the spray hoods might be raised off the ground.
Wiper applicators and sponge bars
Wiper applicators are devices that physically wipe appropriate amounts of Durango directly onto the weed.
Equipment must be designed, maintained and operated to prevent the herbicide solution from contacting desirable vegetation. Operate this equipment at ground speeds no greater than 5 mph. Performance may be improved by reducing speed in areas of heavy weed infestations to ensure adequate wiper saturation. Better results may be obtained if 2 applications are made in opposite directions.
Avoid leakage or dripping onto desirable vegetation. Adjust height of applicator to ensure adequate contact with weeds. Keep wiping surfaces clean. Be aware that, on sloping ground, the herbicide solution may migrate, causing dripping on the lower end and drying of the wicks on the upper end of a wiper applicator.
Do not use wiper equipment when weeds are wet.
Mix only the amount of solution to be used during a 1-day period, as reduced activity may result from use of leftover solutions. Clean wiper parts immediately after using Durango by thoroughly flushing with water.
A nonionic surfactant at a rate of 10 percent by volume of total herbicide solution is recommended for all wiper applications.
For Rope or Sponge Wick Applicators: Mix 3 quarts of Durango in 2 gallons of water to prepare a 25 percent solution. Apply this solution to weeds listed in this section.
For Porous-Plastic Applicators: Solutions ranging from 25 to 100 percent of Durango in water may be used in porous-plastic wiper applicators.
Durango may be used in aerial or ground injection spray systems.
It may be used as a liquid concentrate or diluted prior to injecting into the spray stream. Do not mix Durango with the concentrate of other products when using injection systems.
The rate of Durango applied per acre by vehicle-mounted controlled droplet application (CDA) equipment must not be less than the amount recommended in the label when applied by conventional broadcast equipment. For vehicle-mounted CDA equipment, apply 3 to 15 gallons of water per acre.
For the control of annual weeds with hand-held CDA units, apply a 20 percent solution of Durango at a flow rate of 2 fluid ounces per minute and a walking speed of 1.5 mph (1 1/2 pints per acre). For the control of perennial weeds, apply a 20 to 40 percent solution of Durango at a flow rate of 2 fluid ounces per minute and a walking speed of 0.75 mph (3 to 6 pints per acre).
Controlled droplet application equipment produces a spray pattern that is not easily visible. Extreme care must be exercised to avoid spray or drift contacting the foliage or any other green tissue of desirable vegetation, as damage or destruction may result.
Refer to the label regarding tank mix information.
Grass Seed Production
Types of Applications: Preplant, preemergence, renovation, site preparation, shielded sprayers, wiper applicators, spot treatments, creating rows in annual ryegrass.
Specific Use Recommendations: Applications may be made before, during or after planting or renovation of turf or forage grass areas grown for seed production. Applications must be made prior to the emergence of the crop to avoid crop injury. For maximum control of existing vegetation, delay planting to determine if any regrowth from escaped underground plant parts occurs. Where repeat treatments are necessary, sufficient regrowth must be attained prior to application. For warmseason grasses, such as bermudagrass, summer or fall applications provide best control.
Precautions and Restrictions: Do not disturb soil or underground plant parts before treatment. Tillage or renovation techniques such as vertical mowing, coring or slicing should be delayed for 7 days after application to allow proper translocation into underground plant parts.
Do not feed or graze treated areas for 8 weeks following application.
Apply to actively growing perennial weeds.
Note: If weeds have been mowed or tilled, do not treat until plants have resumed active growth and have reached the recommended stages.
Repeat treatments may be necessary to control weeds regenerating from underground parts or seed. Repeat treatments must be made prior to crop emergence.
Unless otherwise stated, allow 7 or more days after application before tillage.
Best results are obtained when soil moisture is adequate for active weed growth.
Refer to perennial weeds rate section in the label for specific information.