where the introduced insect Oriental Chestnut Gall Wasp (Dryocosmus kuriphilus) is

present. Of the 93 trees planted, 53 survived 12 years and were evaluated for the

presence of Oriental Chestnut Gall Wasp infestation. Among the survivors, 11 had

no wasp galls and 25 had few galls. Because the female parents were all susceptible,

the genes controlling resistance to infestation cannot be cytoplasmic. Numbers of

trees with little or no infestation suggest that genetic control may be a single,

dominant nuclear gene. If this 'is true, resistance can easily be transferred into

timber chestnuts and orchard chestnut cultivars.

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