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Home → Publications → Forest Nursery Notes → 2007 Summer Forest Nursery Notes → 2007 Summer Forest Nursery Notes - New Nursery Literature → Excised Shoots of Top-Pruned Red Pine (Pinus resinosa), a Source of Inoculum of the Shoot Blight Pathogen Diplodia pinea

Excised Shoots of Top-Pruned Red Pine (Pinus resinosa), a Source of Inoculum of the Shoot Blight Pathogen Diplodia pinea

Munck, I. A. Phytopathology 97(7)Suppl:S81. 2007.

Diplodia pinea causes shoot blight and collar rot diseases that kill or otherwise render nursery pine seedlings unmarketable. D. pinea sporulates abundantly on needles and stems it has colonized and killed. Nursery managers sometimes top prune pine seedlings to reduce their height. In late summer 2005, D. pinea pycnidia were observed on excised shoots present in red pine seedling beds that had been top pruned earlier during that third season of growth. This prompted a survey of top-pruned beds at two nurseries to determine incidence and abundance of D. pinea conidia from excised shoots. At each nursery, excised shoots were collected from the seedling canopy in two subplots and adjacent alleyway ground surface in each of five beds (plots). A washing and filtration technique was used to quantify conidia extracted from colonized shoots.


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Author(s): I. A. Munck

Section: Pest Management