Q.Problem With Leaf Curl On Pear Tree
I have a pear tree which is approx 5 years old. It has never borne fruit. The leaves are green but curl up quite quickly and some go brown. I cannot see any places where anything is oozing out of the bark. There are some whitish marks on the branches. Photos attached. I also have similar problems with an apple tree which is roughly 3m from the pear and I will send details in a separate message. Can you please give me some advice on how to deal with this problem. All answers considered including cutting it down and starting again. Regards John R. Symonds email: john.symonds2603@btinternet.com

Certified GKH Gardening Expert
This is one of many soil born illnesses. Probably Phytopthora or Verticillium. These two will cause problems with many tree species.
https://www.gardeningknowhow.com/plant-problems/disease/what-is-phytophthora.htm
https://www.gardeningknowhow.com/plant-problems/disease/verticillium-wilt-treatment.htm