It is such a large infestation that I don't think there's any way to eradicate it completely, but it may take decades before the tree shows signs of stress. You could try brushing them of with a stiff yard brush and keep dipping it in warm water containing insecticidal soap, which will help. Other than that, you could try hanging a bird feeding station filled with something to attract the Tit family as those will eat most kinds of aphids, but unlikely to clear it completely.
Where are you based Bob? That may help in further identification or to point you to a local resource which may help.
A trowel in the hand is worth a thousand lost under a bush.
We are based in North West Essex, thankyou so much for your help, as it has been such a grand part of the garden we would hate to lose it. I trust that your garden is bringing you much pleasure during these strange times. Take care.
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https://www.thompson-morgan.com/pests/scale-insects
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thanks
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thankyou
Bob
I trust that your garden is bringing you much pleasure during these strange times.
Take care.
Bob