Variation in Response of Norway Maple Cultivars to Verticillium dahliae

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Abstract
Significant variation in foliar symptoms and crown dieback was observed over 16 mo among 13 cultivars of grafted Norway maples [Acer platanoides] after stem inoculation with Verticillium dahliae. Cultivars Jade Glen and Parkway showed the fewest symptoms and Crimson King and Greenlace the most, with wide variation among the other cultivars. In a second study, six of the same 13 cultivars were propagated on their own roots and root-inoculated with the fungus. Crimsom King and Greenlace again showed high susceptibility, with high mortality (as much as 80%) and/or incidence of foliar symptoms. The cultivars expressing the greatest tolerance (fewest symptoms and lowest mortality) to root inoculation were also the most tolerant of stem inoculation.

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