I have recently moved house, which has an average sized garden, with a number of older trees and shrubs. One tree ( a fruit tree - not sure what yet - we've only been in the house 3 months!) blossomed well, some fruit has begun to set. The tree looks healthy. However, I noticed today that the under side of many leaves have got a very small red coloured invader - I am calling it a mite - it might not be! Any ideas as to what it is and how to get rid of it.
Thanks
Geoff