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Home → Publications → American Chestnut Proceedings → 1978 → Control of Endothia parasitica Cankers on American Chestnut Sprouts with Hypovirulent Stains

Control of Endothia parasitica Cankers on American Chestnut Sprouts with Hypovirulent Stains

Inoculation of natural infections of Endothia parasitica on 300 American chestnut sprout clumps with a French-derived hypovirulent(H) strain significantly limited canker size. However, control of new infections and untreated cankers in these plots was not observed over a three-year period; probably because the H strain was too restricted in growth and sporulation on American chestnut. In 1977, eight H strains, selected for a range of pathogenicity, compatibility type, and geographic origin, were inoculated as a mixture or individually, or sprayed as a mixture of conidia on 360 native chestnut stems, all previously inoculated with resident virulent strains. All four methods of H treatment significantly limited canker size compared to cankers left untreated. Inoculum containing a mixture of H-strain mycelia was most effective. Whether any of the H treatments will lead to control of secondary virulent infections is still to be determined.


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Author(s): Richard A. Jaynes, John E. Elliston

Publication: American Chestnut Proceedings - 1978