Blueberry bushes are also susceptible to several common diseases, such as mummy berry, stem canker, stem or twig blights, Botrytis blight and leaf spots. It is a serious disease in Michigan and New York. Canker diseases may also cause dieback of shoots, and are sometimes confused with winter injury. A few days ago, I noticed some black spots on the stem of my 2-3 year old Sunshine Blue blueberry bush. The fungus enters the flower buds and eventually moves into the stem. Viral diseases – Blueberry Scorch and Sheep Pen Hill Disease. Symptoms begin as an interveinal yellowing and progress to a bright red. It is presented like a shrub, 30-60 tall. Phytophthora Root Rot Caused by Phytophthora cinnamomi Associated with poor drainage and waterlogged The blueberry (Vaccinium myrtillus) is a fruit bush. Another option may be Blueberry Scorch Virus, although I think that it is one of the diseases … If a large canker is on the main trunk, the tree may ultimately need to be replaced. As a result, a number of disease problems associated with cold stress, particularly canker diseases, are more common here than in other blueberry growing areas. Prune susceptible cultivars during dry weather if possible. BLUEBERRY DISEASE FAST FACTS Canker Diseases (continued) Where: Phomopsis canker has been reported on highbush blueberries in Michigan, Illinois, Indiana, North Carolina, New Jersey, Massachusetts, and New York. Cankers cause a characteristic flagging of shoots during summer. Fusicoccum canker occurs in the northern United States and southern Canada. High soil acidity (low pH) and relatively high organic matter are essential for optimum production. Blueberry treatments, most common diseases and pests of this shrub. As with other canker diseases, the most conspicuous symptom is "flagging"--during the summer, individual stems wilt and die while leaves turn reddish and remain attached. diseases. Canker Diseases. Today, I checked again, and it seems the whole stem is turning black. Canker diseases can be controlled if diagnosed early and action is taken. The most important method of controlling stem canker is to plant resistant varieties in areas where the disease occurs as fungicides are largely ineffective; no varieties of highbush blueberry are resistant to all strains of the disease; infected wood should not be used for propogation The canker restricts movement of water and nutrients, causing the cane to wilt and die. Magnesium deficiency, common in acid soils, causes interveinal reddening because chlorophyll production is reduced. To control canker disease on trees, cut off the affected branch or limb using proper pruning methods. Twig BlighTs, sTem Cankers, and sTem BlighTs Diseases in this group are caused by several fungi, including Phomopsis vaccinii, Stem canker produced by Botryosphaeria corticis and Fusicoccum putrefaciens. With good crop management, most blueberry diseases can be avoided. Blueberry stem canker? Leaves at the bases of young shoots are most likely to exhibit symptoms first. I just planted the bush this year, and this is one of the original canes that was already on the bush when I planted it. In many cases, winter injured wood is susceptible to canker infection. Blueberry has very specific soil requirements, dictated by its unique root structure. Under severe disease conditions, several individual canes may be affected on a single bush. Asked July 5, 2015, 4:28 PM EDT. » Blueberry treatments, most common diseases and pests of this shrub. Blueberry plants (Vaccinium) are susceptible to a wide range of insect pests that can cause major problems with your plants’ health and fruit production. Blueberry Disease Management Monilinia and Phomopsis Monilinia, Botrytis, Phomopsis Anthracnose, Alternaria Anthracnose, Alternaria Diseases Indar, Pristine, ... For stem canker, remove diseased plants and destroy them. Canker diseases frequently kill branches or structurally weaken a plant until the infected area breaks free, often in a wind or ice storm. While most losses are due to root rot, or to stem and twig canker diseases, fruit rots and nutritional problems can also reduce yields.