August 28 quiz

August 28 quiz

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Answer: Blackleg, clubroot, sclerotinia stem rot. Blackleg lesions often have tiny black spots call pycnidia, but the best way to identify blackleg at this stage is to clip stems and look for black discoloration in the cross section. The only way to identify clubroot is to dig up stems and look for galls. Get them tested if you’re not sure. The third stem has the shredding typical of sclerotinia stem rot. You can also see one black sclerotia on the outside of the stem. These are more commonly found growing INSIDE sclerotinia-diseased stems.