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Is my Rowan diseased?

United Kingdom Gb

I will post up a picture when I've taken one in bright sunlight, however, in the meantime, my young Rowan has what looks like bright green blisters on some of the leaves. The tree stands next to a different variety Sorbus which, at the moment, is perfectly normal, however, are we talking disease or previously unobservant gardener? Many thanks



i think it is caused by sap sucking pests and the rowan has produced these bumps as a wound response. mine has them some years and not others and it is growing fine.

1 Jun, 2009

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