We believe we have an answer to our mystery question from last week. One Canola Watch reader who took the quiz suggested dog vomit fungus, which is not a serious problem at all. It shows up very rarely. We can't identify those who take the quiz, but we would like to thank the bright person who suggested dog vomit virus. If that would be OK with you, please email email@example.com.
Here is the mystery photo again. Post a comment below if you have other ideas or observations to add to the conversation.