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Originally Posted by beetkvass
Ok, so we've sliced into a number of stems. I've been unclear on how far gone they need to be do that. One source said to cut into stems that are just starting to wilt another said ones that were dead. Most of them I see no sign of brown on the inside. But I have a picture of one that looks like there might be some brown in it? If it's fusarium would all of them have this?
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You need to cut into stems, not leaf rachises.
I forget which, but one of them requires cutting into the stem within 15 inches or so of the base of a plant, which means it's essentially for the purposes of post-mortem diagnosis.