I am used to aphids, and generally spray the garden. I have a smallish apple tree that I have not sprayed for several years, and it was heavily infested with woolly aphid. Many shoots had died and some branches, and the trunk bark was split, and it has some large galls..
I have cut away all the damaged timber, treated with aphid spray and painted the wounds with a waxy water-repellent stain. I inspected it 10 days after treatment, amd found a few remaining patches of wool which I treated with insecticide.
I was surprised to find that woolly aphid attacks the surface of the wood, not the leaves. Is there any persistent or systemic treatment that will prevent them recolonising the tree?
I have cut away all the damaged timber, treated with aphid spray and painted the wounds with a waxy water-repellent stain. I inspected it 10 days after treatment, amd found a few remaining patches of wool which I treated with insecticide.
I was surprised to find that woolly aphid attacks the surface of the wood, not the leaves. Is there any persistent or systemic treatment that will prevent them recolonising the tree?