Growers are reporting a difficult apple season, which is having a knock-on effect for local tourism

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At this time of year, Pine Crest Orchard in the Blue Mountains town of Bilpin would usually have about 1,000 visitors a day picking their own fruit from trees laden with apples.

But this season, the trees are mostly bare – and no one really knows why.

Orchardist John Galbraith, who owns and runs the farm with his wife, Erica, said he and the other local growers in Bilpin have been left scratching their heads about why, despite heavy flowering in spring, no fruit has formed.