What is Varro™?
Varro is a Group 2 herbicide that contains the active ingredient thiencarbazone-methyl which provides grassy weed control and activity on certain broadleaf weeds.
What crops can I safely apply Varro to?
- Wheat – spring, durum and winter wheat.
What grassy weeds will Varro control?
- Controls: Wild oats, green foxtail, barnyard grass and canary seed.
- Suppresses: Persian darnel, yellow foxtail and Japanese brome.
What is a "broadleaf booster"?
- Varro contains a “broadleaf booster” which means Varro will boost or enhance the dicot weed control of its many broadleaf tankmix partners.
What broadleaf weeds will Varro control?
- Controls: Cleavers, hemp-nettle, pale smartweed, redroot pigweed, shepherd’s purse, stinkweed, volunteer canola, wild buckwheat and wild mustard.
- Suppresses: Lamb’s-quarters, round-leaved mallow and Russian thistle.
Does Bayer recommend a broadleaf tank-mix partner for Varro? If so, which one?
- Yes. In the brown/dark brown soil zone, Thumper or Buctril M are excellent tank mix partners. If targeting perennial weed control, Prestige™, Barricade®, Momentum® and Stellar® mix well with Varro. Other approved tank-mix partners include 2,4-D Ester, AMS, Attain, Broadside, Curtail M, Frontline, Grow TTF, MCPA Ester, OcTTain, Paradigm, Pixxaro, Refine SG, Retain SG and Tilt. Do not mix with products containing dicamba (Pulsar). Add AMS when mixing with Prestige, Curtail M or Momentum.
Will Varro control my Group 1-resistant wild oats?
- Yes, Varro is a Group 2 and therefore is an excellent tool to control Group 1-resistant wild oats. It can also be used in rotation to prevent Group 1 herbicide resistant wild oats from becoming a significant problem.
Can I add Ammonium Sulphate (AMS) for enhanced weed control?
- AMS can be added to Varro in spring wheat for improved activity on wild oats. The benefit of AMS will be more pronounced under cool conditions or heavy populations. Do not add AMS to Varro on durum wheat as durum is more sensitive to crop injury. (Non-Ionic Surfactant) NIS can be added to durum wheat.
I heard that I can plant back to lentils the year after applying Varro. What other crops can I plant back to?
- Varro has a very flexible re-cropping profile and it is safe to plant the following crops 10 months after applying Varro: alfalfa, barley, canary seed, canola, chickpeas, field corn, dry bean, flax, lentils, mustard, oats, field peas, soybeans, sunflowers, timothy and wheat (spring, durum or winter).
What crop stage can Varro be applied to?
- 1-6 leaf stage up to 3 tillers, but prior to appearance of the first node (jointing). Optimum weed control, crop tolerance and crop yield will be obtained when Varro is applied at the 3-4 leaf to 1 or 2 tiller stage of the crop and weeds.
How does drought stress affect the plant and ability to apply Varro?
- Under drought conditions:
- Do not spray an ALS herbicide such as Varro >35 days between seeding and spraying, as drought hastens crop development; the plant matures more quickly, reaching maximum application stage sooner.
- Do not spray within 3 days before or after cold temperatures (3 °C or lower).
What is the mixing order?
- Add Varro first, followed by other liquid herbicides.
- If adding AMS, always put AMS in the tank first. Add Varro to a significant amount of water (a moving stream of water in chemical handler or directly into a half-full spray tank of water). If using a small amount of water, a gel may be visible; this is easily rinsed away with additional water.