Abstract
U.S. hazelnut production, concentrated in Oregon, is threatened by eastern filbert blight and all currently grown cultivars are susceptible. Resistant cultivars offer the best control method. Field screening for resistance takes 2 years for symptom expression. The goal of this study was to develop a rapid and reliable screen; to confirm that resistance in `Gasaway' is conferred by a single dominant gene: and to investigate inheritance in seedlings of the resistant cultivar `Gem'. Nine controlled crosses made in 1987 and 1988 were screened in the greenhouse in 1992 and 1993. Three trees of each genotype were inoculated and scored for presence or absence of the fungus using either stained tissue sections or ELISA within 6 to 12 months. Progenies of `Vancouver Resistant' parents (resistant progeny of `Gasaway') segregated 1 resistant: 1 susceptible and from resistant × resistant parents segregated 3 resistant:1 susceptible in agreement with the single gene hypothesis. Seedlings of `Gem' were all susceptible.
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