Varro

Overview

Varrofield Clean


With outstanding control of wild oats and other problematic grass weeds, Varro® herbicide provides you with a clean wheat field you can be proud of. A powerful early-weed removal specialist, Group-2 Varro offers effective resistance management and exceptional value to help ensure the profitability of your farm.


Varro Advantage

Features and Benefits


  • Strong performance on grass weeds like wild oats, barnyard grass, Persian darnel, green and yellow foxtail, canary seed and Japanese brome
  • Group 2 technology allows for control of problematic Group 1-resistant wild oats and foxtail
  • Allows crop rotation flexibility to sensitive crops like dry beans and lentils
  • Enhances the overall control of its broadleaf tank-mix partners
  • Exceptional crop safety
  • Registered for ground and aerial application

Varro vs. The Competition

Varro for Wild Oat Control


Varro for Wild Oat Control Graph

Source: 5 Bayer Internal Trials.
Your results may vary according to agronomic, environmental and pest pressure variables.

Varro for Green Foxtail Control


Varro for Green Foxtail Control Graph

Source: 3 Bayer Internal Trials.
Your results may vary according to agronomic, environmental and pest pressure variables.

Varro for Yellow Foxtail Control


Varro for Yellow Foxtail Control Graph

Source: 2 Bayer Internal Trials.
Your results may vary according to agronomic, environmental and pest pressure variables.

Active Ingredients

Group 2
Thiencarbazone-methyl
Group 2

Crops

Crops

Wheat, Durum
Wheat, Spring
Wheat, Winter

Weeds Controlled

Varro Varro + AMS1
Grass Weeds
Barnyard grass E E
Canary seed G+ VG
Green foxtail G G+
Japanese brome (spring/fall germinated)1 S S+
Persian darnel S S
Wild oats VG VG+
Yellow foxtail S S+
Broadleaf Weeds
Cleavers G G+
Hemp-nettle E E
Lady's thumb/Smartweed G G
Lamb's-quarters S S+
Redroot pigweed G G
Round-leaved mallow S S
Russian thistle S S
Shepherd's-purse G G
Stinkweed G G
Volunteer canola G G
Wild buckwheat S S
Wild mustard VG VG

Weed Control


EXCELLENT:
100–95%		 VERY GOOD:
94–90%		 GOOD:
89–85%		 SUPPRESSION:
< 84%

1 Velocity m3/Varro + AMS for use on spring and winter wheat only. In durum wheat, add a non-ionic surfactant.

Approved Tank Mixes


Product Wheat
Durum Spring Winter
2,4-D Ester3, 4      
AMS      
Attain XC1      
Barricade® and Barricade II1      
Barricade M1      
Buctril® M      2
Curtail M  3    
Frontline™ XL      
Grow TTF™1      
Infinity®      
Infinity FX      
MCPA Ester    **  
Momentum™1, 3      
NIS (Non-Ionic Surfactant)      
OcTTain™1      
Paradigm™ 1      
Pixxaro™1      
PP-25251      
PP-232351      
PP-311551      
Prestige1  3  **  
Refine® SG      
Refine SG + 2,4-D Ester      
Refine SG + MCPA Ester      
Retain® SG1      
Stellar™1      
Thumper®      
Tilt®1      
Travallas™1      

Apply mixes according to most restrictive use limitation.
1Bayer Tank Mix Exception List.
2Exception Tank Mix control only.
3AMS adjuvant must be used when tank mixing with Prestige or Curtail M.
4Use AMS, followed by Varro, 2,4-D Ester and an NIS Adjuvant.
**Use an NIS adjuvant.


Get the Max from your Tank Mix

Get the Max from your Tank Mix

For a complete list of off-label tank mixes supported by Bayer, please see: Tank Mix List


Early Weed Removal To learn more about how you can achieve a +10% yield increase with Varro herbicide, click here.

Labels & MSDS

Varro Fact Sheet
Varro Label
Varro MSDS
Tank Mix List

Application Tips

Rate
0.20 L/ac.

 

Crops/Application Timing
  • Apply Varro from the 1 to 6 leaf stage on the main stem up to emergence of the third tiller, but before appearance of the first node (jointing)
  • Avoid crop injury: do not apply an ALS herbicide such as Varro following the appearance of the first node
  • Under drought conditions: do not spray Varro herbicide if >35 days between seeding and spraying, as drought hastens crop development
  • Do not spray within three days before or after cold temperatures (3°C or lower)

 

Water Volumes
  • Ground – minimum of 5 US gal./ac. (19 L/ac.)
  • Aerial – minimum of 3 US gal./ac. (11 L/ac.)

 

Rainfastness
  • One hour after application

 

Re-cropping Intervals
Safe to plant within 10 months following Varro application: alfalfa, barley, canary seed, canola, chickpeas, corn (field), dry bean, flax, lentils, mustard, oats (spring), peas (field), soybeans, sunflowers, timothy and wheat (spring, durum, and winter)

 

Residue and Grazing
Do not:
  • Graze the treated crop or cut for forage hay within 7 days or cut for hay within 30 days of application
  • Harvest wheat (spring or durum) for grain or straw within 60 days of application or winter wheat within 72 days of application
  • Re-enter treated fields within 12 hours of application

 

Resistance Management

Varro provides strong performance on grass weeds including Group 1-resistant wild oats and foxtail, making it an important part of your herbicide resistance management strategy.

What is Resistance?

Resistance is a naturally occuring, inherited ability of some weed biotypes to survive a herbicide treatment that should, under normal use conditions, effectively control a weed population. Some herbicide resistant weeds have naturally developed one or more mechanisms that allow them to survive a herbicide treatment.


Types of herbicide resistance infographic.

For a weed to be considered resistant it must:


  • Normally be controlled by the herbicide
  • Survive a usually lethal dose of the herbicide
  • Be heritable, meaning it is passed from generation to generation

Herbicide-resistant individuals are naturally present within a weed population at very low frequencies.

Did you know that there are over 20 Group 1 herbicides on the market?

Development of Herbicide Resistance

How does resistance develop?


The image below demonstrates the interaction between a weed species and a particular mode of action and the development of herbicide resistance at different speeds. It’s clear to see that over time the use of a herbicide quickly changes from being very effective to becoming extremely ineffectual. In fact, by the fifth year of application the herbicide is failing to eliminate herbicide-resistant weeds. It is particularly alarming that there is a dramatic increase in failure rate from the fourth to fifth season.

Development of Herbicide Resistance infographic.
Treatment
% Resistant Weeds in Population Weed Control
0 Application .0001% Excellent
1st Application .00143% Excellent
2nd Application .0205% Excellent
3rd Application .294% Excellent
4th Application 4.22% Excellent
5th Application 60.5% Failure
Source: Weed Science Society of America, 2011

What can you do to delay the onset of herbicide resistance?


  • Don’t rely solely on herbicides for weed control
  • Develop field-specific long-term weed management plans
  • Rotate herbicide groups year over year

General guidelines for herbicide rotations:


  • Avoid repeated use of the same herbicide or herbicides having the same mode of action in the same field year to year
  • Limit the number of applications of a single herbicide or herbicides having the same site of action in a single growing season
  • Use mixtures or sequential treatments of herbicides having different Groups, which are active on the same target weeds whenever possible
  • Use non-selective herbicides pre-seed or pre-emergence to control early flushing weeds (prior to crop emergence) and/or weed escapes

Resistant Weed Management Strategies

  1. CROP ROTATION

    2. Rotate crops as often as possible to utilize the unique modes of action available within the crop.

  2. TIME FERTILIZATION

    3. Time and place fertilizer to benefit your crop, not weeds.

  3. TARGET PROBLEM WEEDS

    4. Systematically target problem weeds and respond quickly to changing weed populations.

  4. SCOUT OFTEN

    5. Scout often and take note of individual weed response to all applications (pre-emergent, post-emergent and pre-harvest).

  5. REMOVE ALL WEEDS

    6. Make sure you remove all weeds before they set seed – even if you have to pull by hand. Remember the old English proverb: One year seeding, seven years weeding.

  6. PERIMETER WEED MANAGEMENT

    7. Leaving a 1m-wide weed-free zone around your cropping fields (so new weeds can’t propagate and expand throughout your fields).

  7. OUTCOMPETE WEEDS

    8. Decrease your row spacing and increase seeding rates to optimize plant populations, maximize crop competitiveness and minimize time to crop canopy closure.

  8. MAXIMIZE YOUR HERBICIDE’S EFFECTIVENESS:
    • Match selection of herbicide(s) with your most difficult weeds
    • Use full-labelled rates
    • Include the best tank mixes and adjuvant(s)
    • Use correct spray volume (follow label directions)
    • Use correct nozzle spacing and droplet size
    • Don’t spray at excess travel speeds, follow label directions
    • Apply during the best weather conditions (warm, humid, and sunny conditions with minimal wind)
    • Maximize rainfastness intervals
    • Time of day (herbicides are most effective when sprayed between 8:00am and 9:00pm)

MixItUp

Herbicide resistance is everyone's problem.This product is a Mix It Up solution.

Visit MixItUp.ca for more simple strategies and solutions.

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