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I have a john downie crab apple tree which is coverefd by a fungus like cotton wool It has stopped the tree fruiting this year and appears to be killing off the tree. Can this be treated and if so, what with




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This sounds like woolly apple aphids which suck the sap and produce a woolly like wax. A severe infestation will damage the tree.
The natural predators are ladybirds so you can encourage natural predators, but as it's not a tree whose fruit you will eat, unless you are going to make crab apple jelly, you could try a systemic insecticide.

31 Jul, 2010

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