Seiridium Canker| Atlanta, Georgia

leyland cypress tree with lesions on twigs oozing sap

Seiridium Canker| Signs and Symptoms

Most Commonly infects Leyland Cypress species. Foliage on affected branches yellows and turns brown in the spring. A sunken canker can be found on the branch below the infected foliage. Bark turns brown, and small fruiting bodies form in the cankered area. Drops of resin are frequently found in and at the sides of the canker. Larger trees may slowly decline from the cumulative effects of multiple cankers.

Management Strategies

Proper establishment and care are the best defenses against Seiridium canker in residential and commercial landscapes. Due to its relatively shallow root system, plant Leyland cypress in tilled and amended soils to encourage plant vigor. Avoiding excessive watering and heat stress is vital to establishment of a healthy Leyland cypress. To minimize water loss and water competition with other plant species such as turf, mulch an area several feet beyond the lowest limbs. During hot, dry summer days, irrigate trees thoroughly around the base of the tree every 7-14 days, depending on soil composition. Take special care for trees located near drive-ways, paved areas or heat-reflecting buildings. Providing adequate irrigation during periods of drought is the best defense against Seiridium canker disease. Sanitation, such as removal of cankered twigs and branches, helps prevent disease spread. Destroy pruned materials, and disinfect pruning tools by rinsing in rubbing alcohol or a solution of 1 part bleach to 9 parts water. Remove extensively damaged trees or trees that are damaged in the main trunk. For more information please see the UGA Cooperative Extension Service

Arborist Evaluations