Posted: 21/07/2013 at 19:02
Depends on the size of the crop as to if you should remove the ones with the blemish, the tree way well abort some of the fruit anyway, too much fruit can spoil the rest of the crop.
Wasps will be at them as soon as they start to get ripe,so be careful when picking.
Take a look here for advice http://www.rhs.org.uk/Gardening/Grow-Your-Own/Advice/fruit-videos or buy 'The Fruit Expert' by Dr Hessayon, less then £10.
You will have to wait for the fruit to try identify what it is.
Unless you have a big ladder the big tree could be reduced a lot in height to make it easier for picking.
I have been watering my Plum Trees every day since the rain stopped.