Kabatina Twig Blight: This disease is caused by the fungus Kabatina juniperi. Apply all chemicals according to directions on the label. Select a fungicide labeled for use on junipers containing one of the following: mancozeb, thiophanate-methyl, or copper fungicides. If chemical control is necessary, fungicides are available to provide protection, but they must be applied before infection occurs. Except on highly susceptible cultivars, pruning will usually control these diseases. Promptly prune and remove any diseased or browning branches as they occur. Do not crowd plants, and avoid using sprinkler irrigation. Plant junipers in areas with good air circulation to promote rapid drying of the needles. Do not stress junipers by planting them in shaded or poorly drained locations. Purchase disease-resistant varieties that are healthy with no evidence of dead or dying twigs. First, closely inspect the entire plant, since symptoms of tip blight and twig blight can be caused by other problems, such as drought, overwatering, or root injury. Prevention & Treatment: Each of these diseases requires similar methods of control. This disease is sometimes confused with mite damage. Needles of spur branches turn brown and die usually in the late summer, leaving a plant with an inner crown devoid of foliage. Branch tips usually remain healthy and green. As disease development progresses, the needle browning spreads upward and outward. It begins by infecting the oldest needles that are located on the lower branches, inside of the plant. Watch for disease development during the spring or summer flush of new growth when warm, wet conditions are present.Ĭercospora Twig Blight: This disease is caused by the fungus Cercospora sequoiae var. Scraping away the bark will reveal a sharp line between discolored, dead wood and healthy wood. Infected twigs first become pale, then turn reddish-brown and finally become brown after death. The new, immature growth becomes infected while the darker green, mature foliage remains resistant to infection. Phomopsis Tip Blight: This disease is caused by the fungus Phomopsis juniperovora and begins by infecting the tips of branches smaller than the diameter of a pencil. Phomopsis blight ( Phomopsis juniperovora) on juniper.īruce Watt, University of Maine,
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