Impact of the Asian wasp Dryocosmus kuriphilus (Yasumatsu) on cultivated chestnut: Yield loss and cultivar susceptibility

•Chestnut cultivars response to gall wasp (D. kuriphilus) infestation was assessed.•Yield loss was evaluated in orchard and cultivar susceptibility in screenhouse.•Damage threshold values were defined.•Different susceptibility levels of major cultivated genotypes were defined.•Nutrient subtraction was highlighted comparing healthy and infected leaves.