Chickweed
Control with Cereal Herbicides
Mike Cowbrough - Weed Management Field Crops Program Lead/OMAFRA, Guelph
Francois Tardif - Department of Plant Agriculture/University of Guelph
Peter
Smith - Department of Plant Agriculture/University of Guelph
07 May 2008
Objective
To evaluate efficacy of large chickweed with Infinity (pyrasulfotole/bromoxynil)
compared to standard winter wheat herbicides used in Ontario under growth room
conditions. Although chickweed is listed on the Infinity label (up to the 6 leaf
stage of growth) chickweed is typically quite large at the time when most herbicide
applications are made.
Limitations/Benefits
Control of weeds is
usually better under growth room conditions compared to field conditions. However,
if a weed is not controlled by a herbicide under growth room conditions, it is
unlikely to be controlled in the field.
Results
- Infinity and
Refine SG (tribenuron/thifensulfuron) provided the best control of chickweed.
- Re-growth
of new chickweed leaf tissue was observed with Infinity compared with Refine SG
.
- Bromoxynil/MCPA and dichlorprop/2,4-D did not control chickweed.
- The
addition of ammonium sulphate (AMS) to Infinity improved efficacy of chickweed.
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| Figure 1. Untreated Control | Figure.
2. Refine SG: 2 weeks after application | Figure
3. Infinity + AMS: 3 weeks after application |
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| Figure 4. Infinity: 3 weeks after application | Figure
5. Bromoyxnil/MCPA: 3 weeks after application | Figure 6.
Dichlorprop/2,4-D: 3 weeks after application |
