How it works

• With its two modes of action — one of which is new to field peas — VIPER® herbicide provides solid weed-resistance management. Plus, you’ll benefit from two kinds of weed control:
  1. Contact – After the herbicide spray directly hits the weeds.
  2. Systemic – uptake from spray solution by the plant and distributed to the growing point for optimum efficacy.

When to apply

• VIPER herbicide should be applied when peas are at the 3 to 6 above-ground node stage (3-6 true leaves) and after weeds have emerged.
• Apply to broadleaf weeds at the cotyledon to 4-leaf stage and to grassy weeds at the 1- to 4-true-leaf stage or early tillering.
• To optimize herbicide performance, apply VIPER in warm weather (15-28oC optimum temperature) to actively growing weeds.
• Do not apply VIPER if freezing temperatures are forecast or immediately after a frost. Temperatures near freezing (below 5°C) will prevent optimum herbicide performance, as weeds are not actively growing.
• For best effect, apply VIPER when kochia is small (less than 3 cm).

How much to apply

• One case of VIPER herbicide treats 40 acres and should be applied in a minimum water volume of 100 L/ha (40 L/ac).
• As with most contact herbicides, VIPER requires higher water volumes for optimal control.
• No need to add MERGE adjuvant to VIPER.
• Each case of VIPER must be applied with two cases of BASF 28% UAN (sold separately) at a rate of 0.8 L/acre. Without this required nitrogen source, VIPER performance is significantly reduced.

Common questions

What is the order that the herbicide components should be added to the tank?
Add VIPER A herbicide component first, followed by VIPER B herbicide component. Add the 28% UAN last.

Why is BASF 28% UAN required for optimum weed control with VIPER?
BASF 28% UAN increases the effectiveness of all components of VIPER herbicide and ensures the best efficacy possible. Failure to include BASF 28% UAN will result in significant reduction in grass efficacy.

28% UAN is needed for optimum weed control. Is it included in the VIPER case?
UAN is sold separately and is applied in a ratio of two cases of BASF 28% UAN to one case of VIPER or one shuttle of BASF 28% UAN to four cases of VIPER.

Weeds controlled

Broadleaf weeds controlled
Cow cockle
Green smartweed
Lamb’s-quarters
Redroot pigweed
Shepherd’s-purse
Stinkweed
Volunteer canola*
Volunteer lentils*
Wild mustard***

Broadleaf weeds suppressed
Cleavers***
Kochia***
Wild buckwheat

Grassy weeds controlled
Barnyard grass
Green foxtail (wild millet)
Persian Darnel
Volunteer barley
Volunteer durum wheat
Volunteer canary seed
Volunteer spring wheat**
Volunteer tame oats
Wild oats***
Yellow Foxtail

Grassy weeds suppressed
Japanese Brome Grass

*Including Clearfield^® canola and lentils
** Excluding Clearfield wheat
*** Including resistant biotypes

Follow crops

The year following VIPER herbicide application, the following crops may be grown in the treated field:

Canary seed
Any type of canola
Chickpeas
Clearfield^® lentils
Clearfield XCEED canola
Clearfield sunflowers
Corn
Durum wheat
Field peas
Flax
Lentils
Spring barley
Spring wheat
Sunflowers
Tame oats

Product specifications