My neighbour’s large sycamore tree reaches over into my garden, where I am growing various vegetables for consumption. It is infested with Sycamore aphids, and my plants are being covered with the sticky honeydew. It is not the end of the world, I suppose, but is there anything that can be done to lessen the problem?
It is not possible to treat a big tree for aphids. Perhaps horticultural fleece might give some relief as a temporary measure.