In response to David J Wilde (What’s wrong with Knavesmire chestnuts?, Letters, September 9) the premature wilting of horse chestnut leaves is the result of the activity of a leaf miner bug that has spread north from Europe.
I understand there is little we can do to eradicate this species specific pest at the moment. There also a horse chestnut die back disease that is not pest-based in the offing but it has yet to arrive here.
J A Whitmore, Orchard Paddock, Haxby
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