Herbicides
265
• 
Safety - page 25 • First aid - page 33 • Resistance management - page 41
rate of Sencor and Eptam. Apply pre-emergence to crop and weeds. Use the higher rate for control of grassy weeds or
when broadleaf weeds are dense.
Application Tips
Allow 4 - 5 days between application of Sencor and post-emergent wild oat herbicides. Allow 4 - 5 days after frost
for crop to recover before applying Sencor. Weed control may be reduced if applied later than the 5-leaf stage of
crop. Crop may be sprayed when wet with dew. When incorporated, crop must be planted at least 5 cm below soil
surface. Uneven application or improper incorporation of can result in erratic weed control or crop injury depending
on rate used.
Stress conditions such as seedling disease, cold weather, deep planting, excessive moisture, high salt concentration,
or drought may weaken seedlings and increase the possibility of crop damage from the herbicides. Temporary
lightening in colour may occur on the margin of leaves or cotyledons and a slight delay in crop development may be
observed. This is quickly outgrown and usually has no lasting effect.
How it Works
A systemic herbicide absorbed by leaves and roots and translocated to new growth. Inhibits photosynthesis and the
weed turns brown and dies.
Expected Results
Broadleaf weeds
:
Initial yellowing 5 - 7 days after application; weeds turn brown and die within
14 - 16
days. Active in soil for a short period and can control new shallow-rooted germinants, like chickweed.
Crops
:
In extremely hot weather or when frost occurs within 1 - 2 days of application, crop will show some
yellowing and slight reduction in height. Discolouration disappears in 7 - 10 days. On Klondike, Johnston, AC
Lacombe and Leduc barley varieties, temporary lightening in colour and reduction in height may occur. Lentils and
peas provide little competition against weed growth due to their low growth habit. Under heavy weed infestations or
lush growth, control may be poor.
Field peas and lentils
:
Stressful conditions increase the possibility of damage. Temporary lightening on the margins
of cotyledons and a slight delay in development may occur. Ensure 70 L/acre water volume is used to reduce crop
injury.
Restrictions
Rainfall
:
Rainfall within 6 hours after application may reduce weed control.
Grazing
:
Do not graze or feed treated crop to livestock within 30 days of application (lentils, peas: 70 days).
Pre-harvest Interval
:
Do not harvest barley, wheat or potatoes within 60 days of application. Do not harvest lentils,
chickpeas, or field peas within 70 days of application. Do not harvest processing peas or chickpeas within 40 days of
application
Re-cropping
: 24
months are required for crops other than potatoes if 910 mL/acre (610 g/acre) is applied on irrigated
alfalfa. Canola, celery, cole crops, cucurbits, lettuce, onions, peppers, spinach, sugar beets, sunflowers, table beets
and turnips may be injured if planted in soil treated with Sencor during the year of application and the following crop
year. Fall seeded or cover crops such as wheat, oats, and rye may be injured when seeded in the same season as the
application of Sencor. For pre-plant applications of Sencor + Treflan or Edge, oats, sugar beets, creeping red fescue
and small-seeded grasses (e.g. timothy, canary seed) should not be planted the following crop year as a precaution.
Environmental Precautions
Avoid contamination of water bodies through the use of recommended buffer zones between treated areas and
sensitive areas.
Runoff
:
Use recommended buffer zones to prevent runoff.
Leaching
:
Leaching is possible with permeable soils and areas with a high water table. Metribuzin may reach surface
water bodies including streams and reservoirs under heavy rainfall conditions.
Toxicity
Moderate oral toxicity. Acute oral LD
50
(
male/female combined rats) = 1,471mg/kg. Mild skin irritant.
Storage
No damage by freezing but avoid large temperature fluctuations. Store in a cool, dry place.
Sencor Solupak 75 DF (cont’d)