Noticed a section only of banding of yellow leafs to my laurel hedging - gardener reckons been sprayed by oddball neighbour and or could it be recent heatwave?
It seems to be where the laurel was 'thinned out' as you mentioned earlier, so I think it probably needs to recover from that and the dry weather isn't helping.
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I'd say it's criminal damage. Someone else will be along to advise you about recovery.