It's a fungal problem. The spores that are produced on the leaves of your Pear trees can only infect species of Juniper. The spores cannot re-infect your pear tree. At this time of year the 'explosions' on the back of the leaves release the spores and they find a home on a Juniper to over-winter. In the Spring the spores that have been produced on the Juniper are only able to infect Pear trees - and so the cycle continues.
According to the RHS, if you want to prevent it happening, you'll need to remove all the Juniper in a 1/2 mile radius - good luck with that
Thanks Pete8, that's good to know. I'll let my folks know. Do you know if they can still eat the fruit, if the trees produce any? I appreciate your help.
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There's not much you can do about it, but so long as it's not very severe your trees should be ok.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
My dad wants to pluck all the bad leaves and burn them. My mum thinks that new leaves will return with the same problem.
It's a fungal problem. The spores that are produced on the leaves of your Pear trees can only infect species of Juniper. The spores cannot re-infect your pear tree.
At this time of year the 'explosions' on the back of the leaves release the spores and they find a home on a Juniper to over-winter. In the Spring the spores that have been produced on the Juniper are only able to infect Pear trees - and so the cycle continues.
According to the RHS, if you want to prevent it happening, you'll need to remove all the Juniper in a 1/2 mile radius - good luck with that
Some more info from the RHS here
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
It's just one of those things...
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.