Rhizosphaera needle cast on blue spruce showing needle loss on lower branches. If you have seen trees affected by needle cast disease in the area, avoid planting this highly susceptible tree. Infected needles first appear mottled or … This publication may be purchased at your local University of Illinois Extension Unit office, or by calling 800-345-6087, or by placing an order online (search for "C1391"). The best way to distinguish Rhizosphaera needle cast from other problematic symptoms is to look for black fruiting bodies on the needles. Repeated needle loss can result in branch death after 3 to 4 years and eventually tree death. Small black fruiting bodies appear in rows on both green and brown needles, and can be seen using a hand lens. Plant spruces that are considered resistant. Finally, do not trim tree branches during wet conditions because this encourages fungal spread. Chemical controls are effective if the disease is not too severe. Small black fruiting bodies appear in rows on both green and brown needles, and can be seen using a hand lens. Needles infected with Rhizosphaera needle cast turn a purplish-brown and will eventually fall from the tree. 3.5 (1 = very little damage 5 = plants killed) Hosts. Trees can be protected from Rhizosphaera needle cast with properly timed fungicide applications. The Illinois Commercial Landscape and Turfgrass Pest Management Handbook (ICLT) is written for professional applicators and provides nonchemical and current chemical recommendations as well as application timing information for all major pests of turf, woody ornamentals and herbaceous ornamentals. Several samples have come into the Plant Disease Clinic lately, showing symptoms and signs typical of Rhizosphaera needle cast. Infection occurs in the spring usually on lower branches and works upward around the tree. Some samples may require further examination or culture work (nominal fee involved) at the U of IL Plant Clinic. Ames, IA 50011-2031 Services include plant and insect identification, diagnosis of disease, insect, weed and chemical injury (chemical injury on field crops only), nematode assays, and help with nutrient related problems, as well as recommendations involving these diagnoses. Spring 2016 was also unusually wet, allowing the fungus to start to build up. Wet years such as 2017 are great for the fungus, but bad for trees. One important way to reduce tree stress is by mulching and watering when needed. Stigmina and Rhizosphaera Needle Cast in Trees. Rhizosphaera needle cast disease, caused by a fungal pathogen, can severely impact spruce, killing needles and causing them to drop prematurely. Trees stressed from drought, poor planting practices or other factors are more likely to suffer from Rhizosphaera needle cast. White spruce is moderately resistant and Norway mostly resistant. Under the right conditions, fruiting bodies can be seen on all sides of the dead (and occasionally on green) needles. The other spruces fall somewhere in between susceptible and resistant. To reduce the risk of reinfection of older trees, continuted treatments may be required. Get positive identification of the disease. Rhizosphaera needlecast is a fungal disease affecting mainly Colorado spruce, and occasionally other spruce. Rhizospaera needle cast of blue spruce. Avoid overhead watering and watering at night. This disease mostly occurs on spruces that are not being grown in their native habitat.Colorado blue spruce is the most susceptible spruce to this disease. Of spruce trees that is received in the lower portion of the and., can severely impact spruce, killing needles and causing them to drop prematurely fungicides Daconil... 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