However, close observation of spore production over the growing season and treatment trials at several North Carolina farms have demonstrated that Needle Blight can be managed such that damage to foliage is light. Few growers are able to maintain or can afford, such a rigorous treatment regime. Earlier names included Cercospordium, Cercospora, and Asperisporium.ģ Historically, disease management recommendations for controlling Needle Blight involved the application of foliar fungicides applied when new growth was emerging and continuing at regular intervals throughout the entire growing season. Passalora sequoiae is the current pathogen name. The name of this Needle Blight pathogen has changed several times there is evidence that it may be caused by more than one fungus. Many growers have experienced mild to severe infection on their Leyland Cypress, and in some cases trees had to be destroyed. The canker and foliar diseases can be spread through cultivation practices such as shearing damp infected trees, which can spread spores of the fungus to other trees resulting in potentially significant damage and financial loss for growers.Ģ In site surveys for disease on farms in North Carolina, only Needle Blight was found on a regular basis and Georgia growers recently identified it as their most significant cultivation issue. Leyland Cypress is prone to several fungal diseases including Seiridium canker, Botryosphaeria canker, Needle Blight, and several root diseases. 1 Managing Needle Blight in Leyland Cypress Unedited NCSU Christmas Tree Note Draft To Be Reviewed Leyland Cypress has quickly grown in popularity on choose n cut farms throughout the south and has eclipsed production of many more traditional species such as Virginia pine and white pine in some areas.
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