QUIZ – Early weed control

Three quick and critical questions on early weed control – two on pre-seed burnoff, one on suspicious patches.

1. Here are four products that can be used in the pre-seed window on fields planned for canola: bromoxynil (Group 6), carfentrazone (Group 14), Tough (Group 6 pyridate) and Conquer II (Group 6 bromoxynil and Group 14 pyraflufen-ethyl). What do they have in common? 
2. Which of the following is the most obvious indicator that weeds could be resistant to herbicide?
3. A University of Saskatchewan study compared three pre-seed burnoff scenarios. Two treatments had similar yield. One treatment had lower yield. Which had the lower yield?