Infinity FAQs

What is Infinity^®?

Infinity is a powerful herbicide that takes out the toughest broadleaf weeds in your cereals. With its unique Group 27 mode of action, Infinity helps ensure the profitability of your farm today and for years to come.

What crops are safe to apply Infinity on?

Infinity is registered for applications in wheat (durum, spring and winter wheat), barley, timothy (seed production only), triticale, perennial ryegrass (seedling and established grown for seed or forage), red fescue and bromegrass (established, grown for seed or forage).

What makes Infinity different?

Infinity has a unique mode of action, Group 27, which at the time of registration (2008) was the first new broadleaf mode of action available to cereal growers in 20 years.

What active ingredients are in Infinity?

1. Pyrasulfotole (Group 27) 
2. Bromoxynil (Group 6)

What wild oat products can I tank mix Infinity with?

Infinity is a preferred tank-mix partner and is registered to be mixed with Puma Advance^®, Varro™, Axial^®, Horizon^® and Liquid Achieve^®. For a complete list of unlabelled tank mixes supported by Bayer please visit: Tank Mix List

What broadleaf weeds will Infinity control?

Infinity controls/suppresses all the weeds listed below PLUS all their resistant biotypes:
Annual sow thistle, chickweed, cleavers, common ragweed, flixweed, hemp-nettle, kochia, lamb's-quarters, pale smartweed, redroot pigweed, Russian thistle, shepherd’s-purse, stinkweed, volunteer canola (including conventional, Round-up Ready, LibertyLink^® and Clearfield^®), wild buckwheat, wild mustard and suppression of Canada thistle, dandelion, perennial sow thistle, and round-leaved mallow. The Infinity label calls for Ammonium Sulphate (AMS) to be added for enhanced cleavers control.

When do I need to add AMS?

Bayer recommends adding AMS Utility Modifier with Infinity for control of cleavers that are in the 4 to 6 whorl stage. The use of AMS with Infinity also improves control of larger kochia and suppression of Canada thistle and dandelion.

How much Bayer AMS Utility Modifier should I add to Infinity?

Bayer AMS Utility Modifier has a concentration of 400 g/L (40% solution) and a label rate of 500 g/ha, therefore AMS should be added at a rate of 0.5 L per acre (20 acres per jug). Add one 10 L jug of AMS for every 6.7 L jug of Infinity.

What is the tank mix order with AMS and other products?

Always add AMS Utility Modifier to the spray tank first, prior to adding any other pesticides.

Are any other products registered for use with Infinity as substitutes for Bayer AMS Utility Modifier?

Only products that are spray grade ammonium sulphate and used at ammonium sulphate rates as indicated on the Infinity label will be supported by Bayer. Water conditioning agents that contain ingredients other than ammonium sulphate (additional salt blends, phosphate ester, propionic acid, phosphoric acid, etc.) will not be supported for use with Infinity by Bayer.

At what crop stage can Infinity be applied to the registered crops?

Infinity can be applied to wheat and barley crops from the 1 leaf stage to the appearance of the flag leaf.

What is the rainfast rating for Infinity?

Infinity must be applied to the plant for a minimum of one hour before rainfall occurs.

How much water should I use when applying Infinity?

Ground application – minimum of 5 US gal./ac. (19 L/ac).
Air – minimum of 3 US gal./ac. (11 L/ac).
Bayer recommends using more water to achieve better coverage when applying the product in dense crop canopies or on advanced growth stage weeds.

How many acres does one jug treat?

One 6.7L jug treats 20 acres (2 X 6.7L case will treat 40 acres), a 107.2L Bulk shuttle treats 320 acres and a 335L Bulk tote will treat 1000 acres.

What crops can be grown the year after an Infinity application?

Alfalfa, barley, canary seed, canola, field corn¹, flax, oats, field peas², potatoes, soybeans¹, sunflowers and wheat (spring or durum) can be planted 10 months following an application of Infinity. Lentils can be planted back 22 months following an application of Infinity.

¹Manitoba only.
²Field peas may be grown the year following Infinity herbicide application in all black, grey-wooded and dark brown soil zones. Do not plant field peas the year following an Infinity application in the brown soil zone where organic matter content is below 2.5% and where soil pH is above 7.5%.

What is the tank mix order?

Infinity first, followed by the tank-mix partner. If adding AMS, always add the AMS to the tank first.

Can I plant field peas following an application of Infinity?

The only scenario where you cannot plant field peas is if you are in the brown soil zone (dark brown, black and grey soil zones have no restrictions), AND you have organic matter content below 2.5% AND soil pH is above 7.5. We only recommend you do not plant field peas if all 3 of those criteria are met.

Testimonials

We thought Infinity worked very quickly. Weeds started to dry down within 4 to 5 days after spraying while the crop looked very good. We tank-mixed Infinity with Puma®¹²⁰ Super , and there was no difference between the spring wheat in the Infinity plot and our check strip. We watch our herbicide rotations pretty closely and, because Infinity contains an active ingredient that belongs to a new group, that will make it a lot easier to manage weed resistance. 

- Gord Mann, Storthoaks, Sask.

We have some round-leaved mallow and kochia on the farm, and Infinity did a good job on both of them. Chances are that a lot of the kochia in our area is resistant to Group 2 chemistry, so we were very pleased with the results. We got good control of hemp-nettle, as well. By using Infinity to clean up hemp-nettle in cereals, we hope it will be less of a problem in flax. We'll definitely be using Infinity down the road. It's a good fit for our farm and offers a new rotation option to manage resistance.

- Rick Metzger, Redvers, Sask.

We tank mixed Infinity with Puma¹²⁰ Super and were very pleased with results. There was no antagonism, the wheat looked good, and Infinity's activity was excellent. Kochia has become a big problem in our area, and Infinity did a good job of controlling it. There's no residue, and Infinity is a new group - we're very impressed with the product.

- Clayton Kuchinka, Future Four Farms Ltd., Macoun, Sask.

Kochia has come out of nowhere to become our No. 1 weed problem, and Infinity did the best job on it of any chemical we've ever used. Infinity was easy to handle - we didn't have to use a surfactant - and the Horizon + Infinity tank mix worked really well. We're also worried about herbicide resistance, and it will be nice to have a new mode of action to manage resistance.

- Shaun Dyrland, Kyle, Sask.

Infinity is the probably the fastest working chemical we've ever used. We could see symptoms on weeds within 24 hours of application, and weeds were dead within a week. We were very pleased with the job that Infinity did on kochia. We've become very reliant on Group 2 chemicals to control kochia, so having a product from a new group is really going to help.

- Paul Hofer, Crop Boss, Arm River Colony, Lumsden, Sask.

We were very pleased with Infinity's activity on cleavers and volunteer canola, and it mixed easily with Puma¹²⁰ Super for control of wild oats and green foxtail. Infinity's concentrated formulation was nice to handle, too. Being a new mode of action is another thing we like about Infinity. Everyone is worried about resistance, so it's nice to have a new tool that we can use in our rotations.

- Glenn Helgason, Foam Lake, Sask.

Infinity did a terrific job on volunteer flax, cleavers and wild buckwheat. From our experience, there are chemicals that will control some of these weeds but not all of them if they are in the same field. Infinity is the first chemical we've used that did the job. There's also a lot of Group 2–resistant kochia in our area, so having a new mode of action is very, very important for us.

- Blair Goethals, Deloraine, Man.

We were very impressed with both crop safety and how quickly Infinity worked. We could not see any difference between spring wheat sprayed with a tank mix of Infinity + Puma¹²⁰ Super and the untreated check strip. And the weeds, mainly smartweed and some Canada thistle, were dead within a week after application. Based on the results we got with Infinity, we'd certainly use it again and would also recommend Infinity to anyone who grows spring wheat.

- Thorsten Stanze, Rosenort, Man.

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.

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 130 Group 2-resistant biotypes in Western Canada?

Why is it important to you?

The management issues and yield concerns with herbicide resistance are very real, especially now with an increasing number of herbicide resistant weeds spreading across Western Canada.

Loss of viable herbicide options

• Have to rely on currently available herbicides for the foreseeable future
• No herbicides with new modes of action are in advanced trials

Would require changes in weed and crop management practices

• Zero or reduced tillage rely heavily on herbicides for weed control

Reduced return on investment

• Increase the cost of weed management
• Loss of yield potential

The number of weeds with herbicide resistance continues to rise

• Including weeds resistant to multiple modes of action

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.

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 modes of action 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

1. CROP ROTATION

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

2. TIME FERTILIZATION

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

3. TARGET PROBLEM WEEDS

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

4. SCOUT OFTEN

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

5. REMOVE ALL WEEDS

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

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

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 rain-fastness intervals.
• Time of day (herbicides are most effective when sprayed between 8:00am and 9:00pm).