QUIZ – This Week in Agronomy

Three true or false questions based on weed, disease and insect issues observed in canola fields this week.

1. Spraying a first application of fungicide at 50% flower, the end of the window, does not provide cost effective control of sclerotinia stem rot.
2. You see weeds poking out of the canopy at this stage of the season. It is too late to spray so, hard as it is, you can ignore them. 

3. What if a canola field has no insects at threshold, but a few pest species are in the field at the same time. A threshold “additive” effect is possible when more than one species are feeding on key yield-producing areas — flowers, buds or pods — at the same time.