Field Violet Control with Cereal Herbicides

Objective

To evaluate efficacy of field violet with Infinity (pyrasulfotole/bromoxynil) compared to standard winter wheat herbicides used in Ontario under growth room conditions. Currently there is little efficacy data for Infinity applied to field violet.

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) provided the best control of field violet.
• Infinity and bromoxynil/MCPA did not control field violet.
• Dichlorprop/2,4-D suppressed growth of field violet.
• The addition of ammonium sulphate (AMS) to Infinity improved control of field violet, although still not at an acceptable level.

Figure 1. Untreated Control	Figure 2. Refine SG: 2 weeks after application	Figure 3. Infinity + AMS: 2 weeks after application

Figure 4. Infinity: 2 weeks after application	Figure 5. Bromoyxnil/MCPA: 2 weeks after application	Figure 6. Dichlorprop/2,4-D: 2 weeks after application