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Plant tissue is scorched in a ring around the top of the plant. The plant recovers and new tissue is unaffected.
This happens when a pesticide spray is used, either at the wrong concentration, when weather is too hot, or when the chemical used is not suitable for the plant concerned.
The damaged area will remain, but all new growth will be ok. Eventually, usually after a very long period, the new growth will dominate and the damaged area will not be significant.
Plants may often be kept for seed production, in which case their appearance is not so important.