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Grape vines grown under glass can suffer from shanking, which means that individual berries within a bunch do not colour up properly, and eventually shrivel up. The affected grapes are inedible.
Grape shanking causes berries to eventually shrivel up. Image: ©www.gardenworldimages.com
Shanking occurs when within a bunch of grapes, individual berries fail to develop their colour. Black grapes remain red and white grapes remain translucent. Affected grapes persist on the bunch, becoming wrinkled and eventually resemble raisins. The flavour of these grapes is unpleasantly sour and watery.
This problem generally results from a variety of growing problems. These include:
Some simple measures can help prevent shanking:
Pay attention also to good grape vine nutrition, care and re-soiling.
Image: © GWI/Dave Bevan. Available in high resolution at www.gardenworldimages.com
Grapes: indoor cultivationGrapes: outdoor cultivationGrapevine diseasesGrey mouldGrapes: pruning and training
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