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Wild Carrot Control with Cereal Herbicides

Objective

To evaluate efficacy of seedling wild carrot with Infinity (pyrasulfotole/bromoxynil) compared to standard winter wheat herbicides used in Ontario under growth room conditions. Currently there is no efficacy data for Infinity applied to seedling wild carrot.

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

Refine SG (tribenuron/thifensulfuron) offered the best control of seedling wild carrot followed by dichlorprop/2,4-D.
Infinity and bromoxynil/MCPA did not control seedling wild carrot.
The addition of ammonium sulphate (AMS) to Infinity antagonized efficacy of seedling wild carrot.

Figure 1. Untreated Control

Figure 2. Refine SG: 2 weeks after application

Figure 3. Infinity + AMS: 3 weeks after application

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