Cultural/Biological: Proper cane spacing and weed control will maximize sun exposure and air flow and facilitate drying of canes. MANAGING RASPBERRY CANE DISEASES Cathy Heidenreich, Small Fruit Extension Support Specialist, ... (Cane blight photos courtesy of Wayne Wilcox, NYSAES Cornell University) Cultural control - Exclude, Inhibit or Limit, and Eradicate! Chemical control. It can be quite serious if widespread or left untreated. Cane blight symptoms. The female beetles create a double row of holes a few inches below the leaf tips in spring, and they lay their eggs in those holes. Cane blight is a nasty fungal disease that affects raspberry, blackberry, and rose plant stems as well as the fruit of apple and pear trees. This pathogen is a wound invader. Anthracnose. Cane blight infection is likely to be more severe in years where heavy rainfall occurred during the harvest period. The extent of damage caused by spur blight in the United States is not clearly understood. Primocane suppression eliminates susceptible tissues when rust spores are present on fruiting cane leaves. The popular Heritage red raspberry cultivar ( Fragaria × ananassa "Heritage") is particularly hard hit by late leaf rust in which powdery masses of fine, light-yellow fungal spores appear on leaf stems and berry caps. Their damage is distinctive and appears about 6 inches below the cane’s tip. Starting with disease free plants is an important part of your disease management plan. 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). SPUR BLIGHT AND CANE BLIGHT OF RASPBERRIES Spur and cane blights are common, serious diseases of raspb erries i n Illin ois, especially dur - ing wet seasons. The infected area turns grey and is usually covered with small black specks. By Albert Parsons. Disease Management. Raspberry Cane Blight: This can be seen identified in the summertime by dead fruit leaves, followed by subsequent cane dieback of canes. The fungus overwinters on diseased canes and plant debris. Notes on Raspberry Diseases: Fire blight Identification . Fire blight can infect raspberries There is no cure for this bacterial disease and pruning is the best treatment . Other Control Options All cases of cane blight occur because of wounds on the canes of bramble plants. Reading Time: 2 minutes. The fungus infects the leaves first and then spreads to the cane. Black raspberries are more susceptible than red or purple raspberries. Any practice that improves drying of foliage, such as keeping fruiting rows narrow and weeded, will help in the control of cane blight. Do not cut back raspberry suckers at all. 'Boysenberry', 'Loganberry', and 'Youngberry' canes are seldom infected with cane blight unless canes first are frozen, pruned, or mechanically damaged. Stress makes plants more susceptible to fungus. All lead to a loss of vigour and fruiting capacity. It also works as a bactericide. Spur blight may be mistaken for winter injury. Note: many things can cause stunted plants, so rule out other causes for proper diagnosis. Cane blight can result in wilt and death of lateral shoots, a general weakening of the cane, and reduced yield. They can infect pruning wounds and other damage sites on raspberry canes. Wait until the first buds produce about 0.75 inch of new growth. Do I need to cut out the plants now? Raspberry canes can grow from 0.5 to in excess of 2 m (1.6–6.6 ft) in height and red raspberry will produce a commercial yield of fruit for 16–20 years, while black raspberry has a shorter lifespan and will produce for 4–8 years. Bud failure is more severe in years when temperatures remain warm into late fall. Do not work with canes in wet weather. Cane blight is one of the more damaging diseases of raspberries. 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