QUIZ – Timely weed topics

Jay Whetter

Four questions on weed management – tank contamination, dust on leaves, spraying at night and timing.

1. Dry conditions and wind can cause dust build-up on weed leaves. What herbicide is most likely to suffer lower efficacy when leaves are dusty? 
2. If days are windy, one option is to spray herbicides at night. A Farming Smarter study compared mid day, midnight and crack-of-dawn spray timing. It confirmed that daytime is best. Which is second best?
3. Moving from pre-seed to in-crop herbicide applications could create contamination issues if the sprayer is not well cleaned. Canola is particular vulnerable to Group 2 contamination. Which herbicide effectively strips Group 2 residues from sprayer plumbing and mixes them into the sprayer solution?
4.

An influential Agriculture and Agri-Food Canada inputs study concluded that without ________, all other major canola inputs will not pay off.