Q.white spider on my Kilmarnoc willow
I have white spider on my young Kilmarnoc willow ( sorry about the spelling )
what spray do I need to buy to get rid of them?

Certified GKH Gardening Expert
Thank you for sending us your gardening question. I'm going to assume you're referring to spider mites, so I'm sending you an article about those.
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-tree-damage.htm
It also could be lace bugs:
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-are-lace-bugs.htm