Forest Services

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Diplodia tip blight is commonly found in Maine and is often associated with red pine (Pinus resinosa) plantations; however, it is also found in the natural forest and ornamental settings. The fungus causes cankers and kills new growth in spring/early summer. Symptomology includes new growth that is partially elongated, brown and brittle, scattered throughout the lower crown and branch dieback that may be traced back to stem cankers further back on the branch. Infection severity tends to increase in response to longer-term stress events like drought or inundation of roots and especially acute stress events like hail injury. Spores are spread by rain splash during prolonged periods of high relative humidity. There is also indication that insects, especially those that feed on cones, may vector the fungus from one tree to the next.



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