We planted two trained fruit trees in February, a double cordon conference pear and an espalier howgate wonder apple. They're in clay soil that we've been improving for a year and a half, and east facing so get plenty of sun. We've given them a good water when the weather has been dry, and they've not been waterlogged.
As the pear leaves have opened, brown patches have developed at the edges of the leaves. I've attached some photos- there are small circular organgey spots,and browing at the edge of some leaves. A few leaves have gone totally brown. Is this a pest, a disease, or a cultural problem like a mineral deficiency?