Pear rust

Pear rust image

Question ...

My pear tree has these strange spots on the leaves late every summer, into the autumn. I am under a flight path - is it possibly caused by droplets of aviation fuel from the passing aircraft?

Answer ...

Your pear tree is suffering from rust -this is nothing to do with the aircraft flying overhead, it is a common fungal disease of pears. It is not especially damaging to the tree, although it does look unsightly. If you want to try and eradicate it, you need to rake up and remove all the leaves as they fall to remove any of the spores from the area. However, you should be aware that the fungus overwinters on juniper (Juniperus sabina) trees up to 6km from the infected pear tree, so eradication may be impossible!

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