Slim pickings: what explains the unusual apple shortage in this Blue Mountains orchard?

Growers are reporting a difficult apple season, which is having a knock-on effect for local tourismGet our breaking news email, free app or daily news podcastAt 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.