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Home → Publications → Seed and Seedling Diseases in the Western US → Effects of Ozone on Sporulation, Spore Germination, and Growth of Fomes annosus

Effects of Ozone on Sporulation, Spore Germination, and Growth of Fomes annosus

Effects of ozone (OJ) on certain cultural characteristics of Fornes annosus were investigated in exposure chamber studies. Growth rates of F. annosus decreased and conidial germ tubes were shorter and had fewer branches as OJ dosages increased. F. annosus conidial production was very sensitive to OJ: very few conidia were produced when cultures were exposed to relatively low dosages (2.400 /ig'mJ-hr). Conidial germination was decreased at the higher OJ dosages. but spore germination was apparently stimulated at low dosages (184 /igl m'-hr). Colonization of wood disks exposed to OJ dosages of 16.870 ug. mJ-hr and greater was significantly less than that of nonexposed disks. However. OJ dosages that can be expected under field conditions appear to have little potential effect upon those aspects of pathogen biology that would substantially affect epidemiology of annosus root rot.


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Author(s): USDA Forest Service