Herbicides
129
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
Fall application
:
It is recommended that both incorporations be completed in the fall. For optimum weed control,
prework the field early in the spring to promote germination of weeds and to allow green growth of resistant weeds
to develop. Use a 5 - 8 cm deep cultivation with vibrashank type cultivator or disc prior to seeding to destroy existing
green growth.
Implements
:
A tandem disc, discer, or field (vibrashank) cultivator is recommended. Set to work 8 - 10 cm deep.
Operate disc implements at 7 - 10 km/hr; cultivators at 10 - 13 km/hr. Do not use a field cultivator to incorporate
when soil is crusted, lumpy or too wet for good mixing. A tandem disc gives best mixing action on stubble.
Application Tips
To avoid concentrating wild oat and volunteer cereal seeds below the treated layer, do not plow the land prior to Edge
application. Do not apply to fields spread with manure during the past 12 months. Do not apply to soils subject to
prolonged periods of flooding or soils in poor working condition. Edge 5G can be used where trash is heavier or on
standing weeds provided they do not interfere with distribution of the granules and do not limit incorporation. Do
not apply on soils with less than 2% organic matter. Application on eroded knolls or Grey Wooded soils with highly
variable texture and organic matter may result in a reduced crop stand, delayed development or reduced yield in
either treated crop or rotational crop.
How it Works
A pre-emergence herbicide that kills seedlings as they germinate. Inhibits cell division in the actively growing points
of the root and shoot. Does not control established weeds.
Expected Results
Weeds
:
Most die before emerging. Weeds will exhibit swelling of the coleoptile region, stubby, thick primary root
development and lack of secondary roots. Plants die from lack of ability to obtain moisture.
Restrictions
Grazing
:
Do not graze the treated crops or cut for hay. There are not sufficient data available to support such use.
Re-cropping
:
Do not grow oats, sugar beets and small-seeded grasses such as timothy, canaryseed grass and creeping
red fescue in rotation following a crop treated with Edge herbicide. Do not seed wheat as a rotational crop on land
if trifluralin and/or ethalfluralin have been used at an oilseed/special crop/barley rate for two consecutive crops.
Do not direct seed (zero till) a rotational crop into standing stubble on land that has been treated with trifluralin or
ethalfluralin for the previous crop. Cultivation prior to seeding of the rotational crop is strongly recommended to help
aerate the soil and promote seedbed conditions, which will enhance seed germination.
Caution
:
The persistence of Edge herbicide is influenced by soil moisture and the majority of breakdown occurs
during the growing season. If drought or extended dry periods were present in the previous year, higher levels
of Edge herbicide may be present in the soil. To reduce the possibility of injury to rotational crops, seed shallow
into a warm, moist seedbed using recommended agronomic practices and seeding depths. As an additional safety
precaution, seeding rate may be increased slightly (10%).
Environmental Precautions
Direct contamination of any body of water with this product may kill fish. Do not contaminate any body of water by
direct application, cleaning of equipment or disposal of wastes.
Toxicity
Ingestion:
Non-toxic. Acute oral LD
50
(
rat) = > 5,000 mg/kg.
Dermal:
slightly toxic.
Storage
Store in areas not exposed to high temperatures or prolonged, direct sunlight. Also, do not let product remain
standing in applicators under these conditions. After filling the granular applicator, close the lid immediately to avoid
prolonged exposure to direct sunlight.
Edge Granular (cont’d)