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