August 7 Quiz Jay Whetter August 7, 2014 Leave a Comment 1. What is this disease? Alternaria black spotBlacklegGrey stemSclerotinia stem rot 2. What is this disease? Alternaria black spotBlacklegGrey stemSclerotinia stem rot 3. What is this disease? Alternaria black spotBlacklegGrey stemSclerotinia stem rot 4. A small 0.5" bertha armyworm in the green phase can look like a 0.5" diamondback moth larvae. One way to distinguish them is to agitate a worm and see how it responds. Only one of these two worms will wiggle backwards and dangle from the plant on a thread. Which is it?Bertha armywormDiamondback moth larva 5. What do you think is the biggest canola production issue for 2014 — so far? And what you like to learn more about through the winter at trade shows, CanoLAB, Canola Watch, etc.? (This answer is not graded for the quiz.) Loading...