[Glyn]

I have a pear tree do not know what type, which I have had
About 20 years, but this year it has started to get a red rash
Over all of the leaves. It is smooth on top but is bumpy on the bottom of the leaf.

[Trillium]

When you say 'red rash' can you be a bit more specific, or even post photos? Does the 'rash' have bubbles, etc?

[Glyn]

have just added a photo, hope this helps

[Trillium]

Thanks for adding a photo, but it's very hard to see what's happening.

Does it look at all like this: http://mygarden.rhs.org.uk/forums/t/26486.aspx

If so, you have pear blister mite and will have to buy a product to control it.

[agapanthus]

I had this last year on one of our pears. I took every single leaf off and it recovered :blink: :blink: I was very surprised!!! It looks fine this year...even has some blossom on it!!!