Dan’s Gardening Tips Dothistroma Needle Blight of Pine

David Hillock – Dothistroma needle blight is a serious disease of pine trees in Oklahoma that causes premature needle drop. The disease affects both landscape plantings and pines in windbreaks. Austrian (Pinus nigra) and ponderosa (P. ponderosa) pines are highly susceptible while Scots or Scotch (P. sylvestris) pine is resistant to this disease. When Dothistroma needle blight is left uncontrolled, trees may be weakened and eventually killed. Symptoms: Although needles are infected in the spring, the symptoms do not develop until the fall. Early symptoms consist of yellow and tan spots that may be bordered by a water-soaked band. As…

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