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Aatrex,
Atrazine, Converge: atrazine
| Author: |
OMAFRA Staff
|
| Creation Date: |
25 November
2002
|
| Last Reviewed: |
21 January
2008
|
Excerpt from Chapter 4, Publication 75, Guide to Weed Control,
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| Trade Names |
Formulation |
Guaranteed active concentration |
Winter
Storage |
Manufacturer /Registrant |
| Su |
480 g/L |
B |
|
| Su |
480 g/L |
B |
|
| SC |
480 g/L |
B |
|
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| Groups |
5 |
| Ontario Schedule |
2 |
| Chemical Family |
S-triazine |
| Crop and/or Non-Crop Registrations |
Corn (ensilage, field, seed and sweet), lowbush
blueberries and triazine-tolerant canola (rapeseed). |
| Sensitive Weeds |
Will control a wide range of broadleaf weeds such
as mustards,
purslane,
ragweed,
smartweed,
lady's-thumb,
wild
buckwheat, lamb's-quarters,
pigweed
and volunteer clover.
Populations of lamb's-quarters, pigweed and ragweed have been
found that are resistant to atrazine and are therefore not controlled. |
| Uptake and Translocation |
Actively absorbed by roots and foliage, although
foliar absorption is usually small. It is translocated to the
top of the plant and accumulates in the leaf margins and the growing
points. |
| Basis of Selectivity |
Metabolism by tolerant species. Spray timing avoids
contact with lowbush blueberries to prevent injury. |
| Application Methods |
For corn, preplant incorporated, preemergence,
or postemergence (with or without oil) usually before the annual
weeds are more than 4 cm high; under dry weather conditions a
shallow incorporation may enhance activity; oil or oil/surfactant
blends will increase the postemergence activity. For lowbush blueberries,
preemergence application. For triazine-tolerant canola, postemergence.
Dry bulk fertilizer may be impregnated with atrazine and applied
preplant incorporated. Atrazine may be tank-mixed with several
other annual grass and broadleaf herbicides to increase the spectrum
of weed control in corn. |
| Residual Activity |
Can persist in the soil for varying lengths of
time depending on rate, weather and soil conditions (longer under
dry, cool weather conditions and in sandy soils). Postemergence
treatments tend to persist longer than preemergence treatments.
See section "Special
Notes for Corn". |
| Unique Characteristics |
Atrazine may carry over for more than 1 planting
season. One year after application there is usually no hazard
to most rotational crops when 1.5 kg ai/ha or less is applied.
Cool, dry weather and sandy soils are conditions under which problems
may arise. See "Notes
on atrazine and simazine soil residues" in "Special
Notes for Corn". |
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