Abstract
Abstract A survey for dead spur was made by rating 8600 ‘Delicious’ apple trees (Malus domestica Borkh.) on seedling rootstock in 3 of the 4 major apple-growing areas of Washington. Only ‘Earlistripe Delicious’ was found to be appreciably affected, and no difference in incidence of dead spur was observed among the areas.‘Oregon Spur Delicious’ and ‘Earlistripe Delicious’ were rated on 5 rootstocks and no rootstock effect was detected. Dead spur symptoms on trees of other strains or cultivars and on pollenizer limbs grafted into ‘Earlistripe Delicious’ affected by dead spur suggest the disorder is transmissible. In addition, an association was noticed between cultivars with long leggy-type growth and the occurrence of dead spur.
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