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|
Ultim
DF: nicosulfuron/rimsulfuron
| 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
| Trade Names |
Ultim 75DF
|
| Formulation |
DF |
| Guaranteed active concentration |
(1:1) 75% |
| Groups |
2 |
| Ontario Schedule |
2 |
| Winter
Storage |
C |
| Chemical Family |
sulfonylurea/sulfonylurea |
| Crop and/or Non-Crop Registrations |
Field corn. Not for use on sweet or seed corn. |
| Sensitive Weeds |
Quack
grass, proso
millet, green
and yellow
foxtail, fall
panicum, barnyard
grass, witch
grass, redroot
pigweed (incl. triazine-resistant) and long-spined
sandbur. |
| Uptake and Translocation |
Following foliar application, nicosulfuron/rimsulfuron
rapidly absorbed through the leaves and translocated in both xylem
and phloem |
| Basis of Selectivity |
Inhibition of acetolactate synthase (ALS) enzyme
in susceptible plants leads to a rapid cessation of cell division
and growth. Tolerant species rapidly convert nicosulfuron/rimsulfuron
to non-phytotoxic metabolites. |
| Application Methods |
Postemergent, within the 1- to 6-leaf stage of
corn. |
| Residual Activity |
Rapid soil microbial degradation of nicosulfuron.
Refer to notes on rimsulfuron
for information on its soil residual activity. |
| Unique Characteristics |
Emerged grasses will be controlled by nicosulfuron/rimsulfuron,
but subsequent germinating grass weeds will not be controlled.
A non-ionic surfactant must be added at 0.2% v/v. Typical symptoms
of plant death (chlorosis, necrosis) occur 5-10 days after application,
depending on growing conditions. Do not use on corn hybrids with
a crop heat unit (CHU) rating of 2500 or less, or in geographic
regions with 2500 or less average seasonal CHU. |
| Manufacturer / Registrant |
Dupont
Canada Inc. |
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