Abstract

Abstract Susceptibility ratings for big bud mite Phytocoptella avellanae (Nal.) are given for 144 clones of filberts (Corylus sp.) and for 1850 progeny between crosses involving 21 parents. There is genetic resistance as well as different levels of susceptibility. Susceptibility is highly heritable and appears to be determined by multiple genes with predominantly additive gene action.

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