Looks like curly top to me. A disease spread by leaf hoppers or in rare cases flea beetles. I never heard of it being spread by aphids, but I suppose it could be possible. I also never knew it was in Japan. I always thought it was mostly found here in the southwestern part of USA.
Either way, if it is curly top virus the only solution is to pull the plant before it spreads to the other healthy plants. (It spreads when an insect jumps from an infected plant to a healthy plant and starts eating)
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Scott
AKA The Redbaron
"Permaculture is a philosophy of working with, rather than against nature; of protracted & thoughtful observation rather than protracted & thoughtless labour; & of looking at plants & animals in all their functions, rather than treating any area as a single-product system."
Bill Mollison
co-founder of permaculture
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