Do not cut back raspberry suckers at all. The fungus overwinters on diseased canes and plant debris. However, cane blight usually covers the whole stem and is not confined to the leaf node areas as with spur blight. It causes necrotic spots on the cane near the base of the petiole attachment. It is usually most severe during wet growing seasons. Asked July 11, 2018, 1:04 PM EDT. Symptoms and Diagnosis. More info on Raspberry beetle. Cane blight: lesion . Cane blight on black raspberry - note gray spore masses. The problem of raspberry spur and cane blight has become more prominent over the past years as the use of some chemicals has been restricted in integrated production (Mikulic-Petkovsek et al., 2014). Raspberry Cultivar Trials, 2005 - 2007 (PDF 150 KB); Description. Black raspberries are more susceptible to cane blight than other brambles. Published: September 21, 2018 Country Crossroads. Do not work with canes in wet weather. What is the best way to treat this blight? During summer, leaves on fruiting canes wither and the bases of the canes turn dark brown, and the bark may split. Control cane vigor to improve air circulation in the plant canopy, which hastens drying of leaves and canes. prune out infected canes; Cane Blight. In the United Kingdom, the vegetative canes of Rubus fruits are affected by 2 distinct fungus diseases named 'cane blight' and 'midge blight', both caused by fungal infection of wounds. My raspberry patch has a blight this year. Cane blight typically strikes areas wounded by pruning and can cause failure of buds to develop, wilting of lateral shoots, and the death of canes. Nova, Julia, and Newburgh raspberry plants are known to be highly tolerant to cane blight. Infected fruit or flower clusters appear water-soaked and eventually turn black. Cane Galls – White growths on canes in early summer. Other Control Options It has yellow stripes on its wing covers and a yellow thorax with two black dots on it. 'Boysenberry', 'Loganberry', and 'Youngberry' canes are seldom infected with cane blight unless canes first are frozen, pruned, or mechanically damaged. Raspberry spur blight is caused by the fungus Didymella applanata. Use the shovel to carefully dig mature raspberry plants or use the trowel to dig raspberry suckers. The grubs of Cane Midge overwinter in the soil and initially emerge as tiny flies in late spring to early summer (dependant on weather conditions). It may attack black raspberry at points where canes have been snapped off or pruned to force lateral growth. A Three fungal diseases affect raspberries – cane blight, cane spot and spur blight – plus a group of viruses. Please see Raspberry Disorders: Spur Blight and Cane Blight … Fire blight-infected raspberry cane tips. I have read that I will need to prune out the diseased plants and use bleach water to disinfect the shears between cutting of each plant. 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