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Austrian pine with tip dieback symptomsBy Joanne Jones CSU Extension Agent, horticulture, Morgan County The Extension office has received several calls from tree owners who are concerned about tip dieback on Austrian pine trees. Some affected trees are located in windbreaks while others are in irrigated yards. The damage is sporadic, with some trees being severely damaged and trees nearby not showing any damage. The described damage is apparent on the central leader and at times other branches are affected, especially in the upper crown. Typically the damage extends back to the previous seasons growth. Ned Tisserat, professor of plant pathology at Colorado State University has received samples with the same type of damage. There is no black discoloration or resin soaking of the damaged tissue with this type of injury and no indication there are insects present. Tisserat believes the damage is triggered by winter conditions, perhaps a combination of desiccation and cold temperatures. Affected trees are not usually permanently damaged by the problem. Trees should be protected from stress by making sure the tree receives moisture, even in winter months, whether from rainfall, snowfall or irrigation. The moisture should soak into the soil 6 to 10 inches and the moisture should be uniform around the tree in the critical root zone. The critical root zone is often defined as an imaginary circle on the ground that corresponds with the "dripline" of the tree. The dripline of the tree is where the tree's branches end. For more information about trees or other horticulture topics, contact Joanne Jones at the Morgan County Extension office at 970-542-3542. 8/4/08 Date: 7/28/08
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