It looks bad. I don't think it's fusarium - i have had that, and what happens is that at first the branches yellow on random branches, not from the bottom up. And, when you pull the plant out, cut the main branch and you'll see brown scarring INSIDE the stem (usually not in the 'armpits' as your pictures show - as the determiner. Unfortunately, I don't know what it is your plants have, however.
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