Blue Spruce Disease Treatment

The disease can be effectively controlled by applying fungicides containing chlorothalonil. Disinfesting pruning tools in a 10 chlorox solution or 70 alcohol between cuts will prevent the spread or the disease to healthy trees or branches. Some locations have an additional infection period in September and October. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas Photo 1. Water requirements The Blue Spruce is drought tolerant meaning it can survive in prolonged dry periods. Spruce spider mites This mite primarily feeds on older inner needles causing needles to look pale yellow and sickly. Concert II Heritage Pageant and Trinity are labeled for use in commercial and residential landscapes and nurseries but data regarding their efficacy is lacking for this disease.

Another fungal disease affecting spruces is Rhizosphaera needlecast.

Injured needles tend to drop from the lower canopy similar to needles with fungal disease. Norway spruce is relatively resistant. Stigmina and Rhizosphaera Needle Cast in Trees These diseases primarily affect blue spruce. Well-timed sprays in the spring will normally suppress Rhizosphaera to non. Apply a fungicide when new shoots are 1½ inches long and again 3 weeks later to protect young needles from infections that occur in May through June. Blue and Engelmann spruce are highly susceptible.

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Blue spruce disease treatment. Water requirements The Blue Spruce is drought tolerant meaning it can survive in prolonged dry periods. New growth can be protected and the tips of branches will continue to grow and mask the older defoliated stems and branches if the disease is detected early before branches have been killed. Rhizosphaera needle cast causes needles to turn purplish brown and fall from the tree usually from the inside of the tree working out and from the bottom of the tree working up.

For Rhizosphaera needle cast two properly-timed applications per year for at least two consecutive years and sometimes three years is required for control. Some Colorado blue spruce cultivars like Hoopsii and Fat Albert are reportedly more resistant to the disease. The disease referred to as Rhizosphaera needle cast is the most common problem seen on blue spruce samples that are submitted to the Plant Disease Clinic.

Spruce spider mites This mite primarily feeds on older inner needles causing needles to look pale yellow and sickly. The disease can be effectively controlled by applying fungicides containing chlorothalonil. Disinfesting pruning tools in a 10 chlorox solution or 70 alcohol between cuts will prevent the spread or the disease to healthy trees or branches.

Colorado spruce is the major host of rhizosphaera. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas Photo 1. Clean tools thoroughly and disinfect with rubbing alcohol a 10 bleach solution or comparable disinfectant after each cut when pruning out diseased wood.

Heavily infected trees may require several years of fungicide applications but should be sprayed soil drenches are not effective. Leave at least a 2 inch space between the mulch and the trunk to allow for air movement. Norway spruce is relatively resistant.

Symptoms - The disease. Karen Delahaut formerly of the University of Wisconsin Madison Photos courtesy of Brian Hudelson Plant Disease Diagnostics Clinic UW-Madison. Blue and Engelmann spruce are highly susceptible.

If affected trees cannot be treated the tree must be removed to prevent the disease from spreading to other trees. Well-timed sprays in the spring will normally suppress Rhizosphaera to non.

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Some Colorado blue spruce cultivars like Hoopsii and Fat Albert are reportedly more resistant to the disease.

Water requirements The Blue Spruce is drought tolerant meaning it can survive in prolonged dry periods. The mites themselves may be. White spruce is somewhat susceptible. Water requirements The Blue Spruce is drought tolerant meaning it can survive in prolonged dry periods. Norway spruce is relatively resistant. Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. Maintain a 3 to 4 inch deep even layer of wood chip mulch around your tree to prevent weed growth. Some Colorado blue spruce cultivars like Hoopsii and Fat Albert are reportedly more resistant to the disease. Stigmina and Rhizosphaera Needle Cast in Trees These diseases primarily affect blue spruce.

Apply a fungicide when new shoots are 1½ inches long and again 3 weeks later to protect young needles from infections that occur in May through June. Water requirements The Blue Spruce is drought tolerant meaning it can survive in prolonged dry periods. Disinfesting pruning tools in a 10 chlorox solution or 70 alcohol between cuts will prevent the spread or the disease to healthy trees or branches. Spectro-90 or copper-based fungicide can protect new growth and prevent new infections. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas Photo 1. Avoid pruning or working around trees when foliage twigs and branches are wet because water disperses the fungal spores. Spruce spider mites This mite primarily feeds on older inner needles causing needles to look pale yellow and sickly.