I had this on several plants this year, mostly dwarfs and micro dwarfs. Mine started like that, went darker yellow, infected the closest leaves, always starting at stem and then moving out. I just trimmed he bad branches off asap to try to stop it, and has worked well. I did google it and will look in my notes. It was (I think) a type of wilt that is characterized by yellowing of single branches typically on one side of plant.
Best weather this year but I have been guns blazing here in Jupiter with the worst flying aphids, whitefly, hornworms, even army worms and fungus gnats! Stupid mistake of buying MiracleGro potting mix (NOT moisture control!) again this year. I forgot how much the gnats love that stuff!
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