|The leaves on the pear tree are curling especially the new growth. What is the cause?|
That may be due to some type of insect feeding on the young leaves. Aphids are among the insects that can cause leaves to curl. Another possibility is damage from a broadleaf weed killer. Using a weed and feed fertililzer around the plants is one way such weed killer damage can occur. Another is using a sprayer to spray the pear that had previously been used for spraying weeds.
I suggest you take some of the leaves (cut off the end of a shoot with leaves attached) to your parish Extension Office to see if they can look it over and make a more positive diagnosis. Put the sample in a plastic bag so no culprits escape.
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