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Princep
Nine-T, Simadex, Simazine: simazine
| Author: |
OMAFRA Staff
|
| Creation Date: |
25 November
2002
|
| Last Reviewed: |
21 January
2008
|
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order
this publication
| Groups |
5 |
| Ontario Schedule |
2 |
| Chemical Family |
S-triazine |
| Crop and/or Non-Crop Registrations |
Corn, established asparagus, bird's-foot trefoil,
raspberries, loganberries, blackberries, highbush blueberries,
alfalfa, apples, apricots, cherries, peaches, pears and plums
established for 1 year or more; grapes established for 3 or
more years; shelterbelts established for at least one growing
season (caragana, green ash, Siberian elm, American elm and
Manitoba maple); new or established Christmas tree and woodland
plantations (2 years or older white pine and balsam fir); woody
ornamentals and nursery stock established for at least 1 year
(cedar, barberry, apple, flowering crab apple, box wood, cotoneaster,
dogwood, holly, rose, yews, chamaecyparis, hemlock, juniper,
multiflora rose, peony; spruce, mugho pine, black walnut and
white ash); nursery container stock (cedar, juniper, yew); aquatic
weed control; non-crop land. Conifer site preparation before
planting of fir, pine and spruce (Princep Nine-T only). |
| Sensitive Weeds |
Annual broadleaf weeds such as pigweed,
lady's-thumb,
lamb's-quarters,
purslane,
ragweed,
volunteer clover, wild
buckwheat, smartweed,
plantain
and groundsel;
annual grasses such as barnyard
grass, crab
grass, wild
oats and yellow
foxtail (triazine-resistant biotypes of foxtail, lamb's-quarters,
pigweed and groundsel
will not be controlled); most perennial species starting freshly
from seed. |
| Uptake and Translocation |
Absorbed by roots; little or no foliar absorption;
translocated upwards in xylem, accumulating in apical meristem
and leaves. |
| Basis of Selectivity |
Some species, such as corn, metabolize simazine.
In most crops, selectivity is based on the roots of the crop plants
being deeper than the depth to which simazine leaches. |
| Application Methods |
Preplant incorporated (to a depth of 2.5 cm) or
preemergence in corn; preemergence in other crops. Broadcast or
band application. In fruit crops, apply a 1 m wide band under
the plants; cultivate or sod the area between the rows. For aquatic
weed control, apply as a draw-down treatment or water-volume application
in drainage ditches and ponds with no water flow-through. |
| Residual Activity |
Soil residues may persist for more than 1 season.
After spraying with simazine, do not plant any crop in the treated
area in the same year except corn. Where rates in excess of 2
kg/ha have been applied, do not plant rotational crops in the
following year; soils should be tested if there is any question
of excessive residues remaining. |
| Unique Characteristics |
Needs sufficient moisture to be activated. Should
be applied only once per season. To avoid build-up of resistant
weeds, simazine should be rotated with other non-triazine residual
herbicides. Simazine is more persistant than atrazine.
Where rainfall is sufficient to cause erosion, soil containing
simazine may wash to lower areas of land and injure existing or
subsequent crops. |
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