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Yellow blotches on the foliage of raspberries are likely to be caused by a tiny sap-sucking mite that lives on the underside of the leaves. Despite the appearance of plants with this mite they are often still able to produce a worthwhile crop of fruit.
Raspberry leaf and bud mite
Raspberry leaf and bud mite is a microscopic mite that causes yellow blotches on raspberry leaves. It can sometimes be mistaken for a virus infection.
Raspberries with leaf and but mite show a number of symptoms;
Note: Some virus infections also cause yellow markings on the foliage, usually accompanied with stunting of the canes and poor fruit production. The mite is a more common problem than virus infections.
None of the pesticides available to home gardeners will control this mite.
The microscopic mites overwinter in and around the buds on raspberry canes.
They emerge in late spring and begin feeding by sucking sap from the underside of leaves. This results in yellow blotches developing on the upper surface and slightly darker patches on the lower leaf surface where the mites are active.
The mite population increases during the summer and leaves at the shoot tops may fail to expand to their usual size and shape in heavy infestations.
Blackcurrant big bud mite
Raspberry cane blight
Raspberry spur blight
Red berry mite
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