Conifers (dreaded Leylandii)
Your advice please. I have a row of conifers which are quite attractive but less so than they once were. In essence, a few have been attacked by aphids and I was hoping you could advise me on the best treatment I should adopt - eg a product for spraying? They hide an eye sore and have taken me 15 years or so to grow and prune.
As ever - very many thanks in advance.