A The disease is caused by the fungus Didymella applanata. Symptoms appear in late spring or early summer as chocolate-brown, dark-blue, or purplish spots or bands on new canes and petioles. Blackberries and dewberries are highly resistant to this disea se. What is spur blight? Raspberry spur blight is caused by the fungus Didymella applanata. The attacked branches will become dried from their tip to their base, and the attacked bark will peel. Purple to brown areas (lesions) appear just below the leaf or bud, usually on the lower portion of the stem. Join Cane botrytis symptoms on raspberry primocanes: Learn more: Notes on raspberry diseases: Cane botrytis. 020 3176 5800 These blights often occur to- gether on red raspberries, weakening the canes and reducing yield. 222879/SC038262, Conspicuous purple patches on new canes in late summer, centred around the buds. Raspberry Spur Blight. This site is maintained by Center for Agriculture, Food and the Environment in the College of Natural Sciences. These lesions enlarge until the cane is girdled. They are seen most easily in primocanes – first year canes – since older canes are darker in color. On overwintering red raspberry canes, spur blight appears as purple to brown cankers below the buds. Mature leaves are more susceptible to infection than young leaves, and so disease usually begins on the lower third of the cane. Spur blight is a disease of red raspberries caused by the fungus Didymella applanata. Lesions are fairly superficial and the fungus does not invade the vascular system. Remove any infected primocanes and burn or bury them. Spur blight is a disease of raspberries caused by the fungus Didymella applanata. Join the RHS today and support our charitable work, Keep track of your plants with reminders & care tips – all to help you grow successfully, For the latest on RHS Shows in 2020 and 2021, read more, RHS members get free access to RHS Gardens, Free entry to RHS members at selected times », Reduced prices on RHS Garden courses and workshops, Our Garden Centres and online shops are packed with unique and thoughtful gifts and decorations to make your Christmas sparkle, General enquiries N.p., n.d. The fungus infects leaves and grows down the petiole and into the cane, where it forms a lesion. The cultivars ‘Glen Lyon’. Raspberry cane blight is a common and serious fungal disease of raspberries, causing extensive die-back of canes. A preventive fungicide application may be desirable after pruning if the planting has a history of spur blight. Caption: Raspberry cane blight causes the canes to turn brittle Q Tell me more about raspberry cane blight. 2014-70006-22579 from the USDA-National Institute of Food and Agriculture. Blackberry (Rubus spp. Cane blight . Proper cane spacing and weed control will maximize sun exposure and air flow and facilitate drying of canes. It survives the winter in lesions on diseased canes. The fungus survives the winter in infected plant … Mon – Fri | 9am – 5pm, Join the RHS today and support our charity. They increase in size, spreading up and down the cane from the point of infection, As autumn and winter progress the patches become less distinct, fading to a pale grey or silvery colour. Look at your primocanes in late summer or early fall before they harden up for winter to see if you have Spur Blight in Home Raspberry Plantings. In extremely overgrown and weedy plantings, the disease can cause a loss in yields, especially if excessive nitrogen is applied. The Royal Horticultural Society is the UK’s leading gardening charity. RHS members can get exclusive individual advice from the RHS Gardening Advice team. Even commercial growers are fast running out of effective pesticides, and none of … This disease is more common and serious on red raspberries and to a lesser extent on black and purp le raspber ries and loganb erries. Didymella applanata produces two spore types. These are three fungal diseases that cause cankers on bramble canes, making them less vigorous and, in some cases, causing their death. Controlling Raspberry Diseases. It appears from late summer and persists on infected canes until the following year. They are followed shortly by many slightly larger, black, erupting spots, another form of fungal fruiting body (perit… Information is given about raspberry spur blight, a disease of raspberries [Rubus idaeus] and loganberries [R. loganobaccus], caused by the fungus Didymella applanata. Early cane blight infections may resemble spur blight; however, cane blight usually covers the whole stem and is not confined to the leaf node areas as with spur blight. An application of lime sulfur before growth resumes in spring can decrease disease incidence. Spur blight is caused by the fungus Didymella applanata, which overwinters in infected canes. The first type starts the infection on the new canes in the spring, while the second causes further spread during the summer. Spur blight is caused by Didyimella applanata. Avoid excess nitrogen. Fungi survive winter in infected floricanes. Symptoms You may see the following symptoms: During summer, leaves on fruiting canes wither and the canes die Avoid overhead irrigation, as it soaks the foliage and contributes to splash dispersal of spores. Proper fertilization and irrigation also help prevent plant stress. However, the symptoms do not occur until mid- to late summer on overgrown, excessively vigorous canes.