Yes ... blackfly are a type of aphid. Squirt them off with a hose-pipe, if you're allowed to use a hose. If not, brush them off with gloved fingers or encourage small birds, wasps, hoverflies, lacewings, and of course, ladybirds ... all of whom will eat them. The growing tips may look disfigured for a while, but it will act like a sort of 'pruning' and encourage sideshoots to grow ... and when you next trim your hedge you'll be removing the growing tips anyway.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
The black fly will not harm the hedge in any terrible way .IJust squirt any I see with an old squirts type bottle with soapy water in .It works on some plants and not on others …….you could try that if you like .
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Not sure if they are one and the same.
Squirt them off with a hose-pipe, if you're allowed to use a hose. If not, brush them off with gloved fingers or encourage small birds, wasps, hoverflies, lacewings, and of course, ladybirds ... all of whom will eat them.
The growing tips may look disfigured for a while, but it will act like a sort of 'pruning' and encourage sideshoots to grow ... and when you next trim your hedge you'll be removing the growing tips anyway.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.