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Treating botrytis blight9/13/2023 In some years, cane diseases kill nearly all of the canes in certain raspberry patches, resulting in little or no crop the following summer.If all the canes died to the ground during the winter: You can mow summer-bearing raspberries if cane diseases have been a big problem.If you mow all the canes, you won’t have a crop the next summer.Summer-bearing raspberries are produced on floricanes.Mowing is often used for fall-bearing raspberries to reduce labor.If you mow the patch, you’ll still have a raspberry crop the next year.Fall-bearing raspberries will produce fruit on primocanes.Cutting and removing all floricanes will sharply reduce new infections.All cane diseases move from the overwintered floricanes to the newly-sprouted primocanes.Mowing will reduce cane diseases and protect the crop for the following summer. Splashing water moves spores throughout the plant and to neighboring plants.Ī more drastic way to control cane diseases is to mow the whole raspberry patch in late winter or early spring and remove or burn the canes.Fungal spores are produced on infected plant parts throughout the growing season whenever wet weather occurs.None of the cane diseases infect the roots.The fungus grows through the leaf stem into the cane. The spur blight fungus infects mature leaves on the lower third of the plant.By fall, canes of red raspberry are resistant to infection. Wounded young canes quickly develop severe disease. The cane blight fungus infects canes through wounds only.It can infect primocanes, leaves, fruit, flower buds, and leaf stems. The anthracnose fungus infects only young green tissue.Infection occurs on different plant parts for each disease.The fungus that causes spur blight spreads by the wind as well as splashing water. The fungi that cause anthracnose and cane blight only spread by splashing water.Fungal spores of all three diseases are produced on infected floricanes during wet weather.Fungi survive winter in infected floricanes.These fungi can be brought into a garden on raspberry plants that are infected with the disease or from nearby, wild plants.Anthracnose is caused by Elsinoe venata.Spur blight is caused by Didyimella applanata.Cane blight is caused by Leptosphaeria coniothyrium.Raspberry cane diseases are caused by three different fungi.In raspberry patches infected with cane diseases, the floricanes die to the ground or to the infected part of the cane.When winter injury is the only cause of cane death, the canes die back to snow level and the floricanes will sprout in living buds below the snow level.Disease symptoms are not easy to see in brown bark and dead canes. These diseased, dead canes are often mistaken for winter injury. In the spring, the overwintering canes are often dead from the disease. The unique symptoms of each disease can be seen on primocanes in late summer and early fall before the canes turns brown. ![]() The green fleshy stalks of primocanes are easily infected by the fungi that cause cane diseases.Primocanes are first year canes that sprout in the spring.The best time to identify all three cane diseases is to look at primocanes in late summer and early fall. Cane blight and spur blight can cause significant damage to red raspberry.It can cause some damage to red raspberries as well. Anthracnose is most severe in black raspberries.Some cane disease fungi survive on wild Rubus spp.Cane diseases can infect red raspberry, black raspberry and blackberry.See Growing raspberries in the home garden for more information on keeping plants healthy. Remove all floricanes and infected primocanes after harvest.Reduce cane diseases by maintaining narrow beds and open canopies within the raspberry patch.Cane disease fungi thrive in wet weather and spread on splashing water.Cane diseases can kill part or all of the raspberry cane.Spur blight, anthracnose and cane blight are fungal diseases that infect raspberries.
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