Herbicides
315
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
BASF 28 % UAN: 0.81 L/acre. BASF 28% UAN (sold separately) must be used with Viper at 0.81 L/acre. Note:
Merge adjuvant is not required for use with Viper.
Application Information
How to Apply
:
Apply with ground equipment only. Do not apply by air.
Water volume
: 40
L/acre.
Mixing Instructions
Use mixing instructions “b” on page 13.
Application Tips
Water soluble bags will dissolve better when kept intact; do not split bags. If agitation is stopped for more than
5
minutes, re-suspend spray solution by full agitation prior to commencing spraying again. Do not spray Viper if
temperatures of +5
o
C or lower are forecasted within 3 days of application. Cold temperatures near freezing will
negatively affect herbicide performance, as weeds are not actively growing. Initial transient crop yellowing may be
observed after application, but this is outgrown and should not affect yield. Apply Viper when broadleaf weeds are
small and actively growing and before weeds reach the maximum size recommended for control. DO NOT apply
VIPER Herbicide to field peas that have been subjected to stress from conditions such as hail damage, flooding,
drought, hot, humid weather, widely fluctuating temperature conditions, prolonged cold weather or injury from prior
herbicide applications, as crop injury may result.
Failure to include UAN will result in significantly reduced product performance.
How it Works
Imazamox is a systemic herbicide absorbed by foliage and roots that disrupts plant metabolism causing growth
to stop. Bentazon is a contact herbicide taken up primarily through the leaves and interferes with photosynthesis.
Thorough coverage of foliage is important for consistent weed control.
Restrictions
Rainfall
:
Rainfall within 6 hours of application may reduce activity.
Grazing
:
Do not graze treated field peas or cut for feed within 20 days of application.
Pre-harvest Interval
:
Do not apply within 60 days of harvest.
Re-cropping
:
Winter wheat may be seeded 3 months after application. Canary seed, CLEARFIELD canola, non-
CLEARFIELD canola, chickpea, field corn, field pea, flax, lentil, oat, barley and spring wheat (including durum),
CLEARFIELD sunflowers and sunflowers may be seeded the first spring after application and tame mustard the
second season after application. A field bioassay (a test strip grown to maturity) is recommended the year before
growing any crops other than those listed above. Contact manufacturer for additional information on recropping
intervals (1-877-371-2273).
Do not apply Viper more than once per year.
Environmental Precautions
Viper tank mixture is highly toxic to non-target plants. Observe buffer zones specified under Directions for Use.
Runoff
:
Prevent contamination of aquatic and sensitive terrestrial areas through using the recommended buffer
zones. Coarse textured soils are more susceptible to leaching.
Toxicity
Viper components: Imazamox - very low toxicity by ingestion. Acute oral LD
50
(
rats) = > 5,000 mg/kg. Low toxicity
by contact. Bentazon - moderately toxic by ingestion. Acute oral LD
50
(
rats) = > 1,089 mg/kg. Moderately toxic by
contact.
Storage
Do not freeze. Store in a cool, dry place above 5°C.
Viper ADV (cont’d)