Sudden death of leaves on potted apple tree
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I bought a dwarf apple tree from the supermarket a few months back. Said it was suitable for pots but it was too late to plant it out anyway so into a bigger terracotta pot it went and it's been growing really well.
Yesterday evening I noticed the leaves looked a bit droopy and I water/fed it. This morning some of the leaves including big ones are half crispy brown, the patches start from the tip or outside to the middle before enveloping the leaf.
The tip shoots are now curled and brittle but I can see nothing inside. There is some white fluffy stuff at some leaf joints but not the ones dying. A bit of the bark on one semi hardwood bit has been eaten away. It's all occouring on the grafted part and not on the root stock part that goes half way up the trunk
No sign of bugs, no sign of rust or mildew, cool sheltered space with light but the area is too windy for preditory insects and it's been as happy as larry until the last 2 days. I'm devastated and helpless as searches don't bring up this combination.
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