Dear Helen,
We to have had some problems with yellowing mature leaves from 2 year old
trees, all else seems equal. What chemical didyou use to attack these little
brutes? I did have some previous problems with 2 year old trees in the green
house still in pots and when repotting found that the grubs had eaten most
of the major roots off creating a severe leaf drop. I washed the soil from
the trees and replanted after cutting them back, they all came away OK after
a couple of months.

Sharn