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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 during summer. Despite the unhealthy appearance of heavily infested plants, 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, which can 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.
Some raspberry cultivars are less susceptible to the mite. Observations on plants grown at Wisley indicate that these include ‘Glen Lyon’, ‘Glen Rosa’, ‘Glen Prosen’, ‘Glen Magna’, ‘Malahat’, ‘Gala’, ‘Tulameen’, ‘Julia’, ‘Rossana’, ‘Leo’, ‘Galante’, ‘Terrie Louise’ and ‘Lauren’.
Heavily infested plants that no longer produce a worthwhile crop should be replaced.
More susceptible cultivars include ‘Glen Ample’, ‘Glen Shee’, ‘Malling Jewel’ and ‘Malling Enterprise’.
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 miteGall mitesRaspberriesRaspberry beetleRaspberry cane blightRaspberry spur blightRed berry mite
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