pear tree leaves
I have two Bartlett pear trees. On one the leaves are nice, green and full, but the other's leaves are brittle and dry but green. They both get the same care and watering. The one hasn't lost any leaves but they are just dry and brittle.
Certified GKH Gardening Expert
This could be Fire Blight.
Here is a link that explains this bacterial disease and how to treat.