Damage ratio of the Asian chestnut gall wasp, Dryocosmus kuriphilus Yasumatsu, 1951 (Hemiptera: Cynipidae) in Samsun Province of Türkiye: First Report

The Asian chestnut gall wasp Dryocosmus kuriphilus Yasumatsu (Hymenoptera, Cynipidae) is a critical pest that threatens cultivation. causes yield losses by deforming the buds of infected trees. This pest, which was first detected in Italy 2002 Europe, seen Gacık village Yalova province 2014 Türkiye. In following years, it spread to Bursa, Istanbul, Sakarya, Kocaeli, Balıkesir, Bilecik, Düzce, Giresun, Bartın, Zonguldak, Sinop and İzmir provinces. this study, orchard gene resources belonging Ali Nihat Gökyiğit research station Samsun examined for presence wasp. As result determined cultivars Marigoule' 'Macit 55'. counts made 50 cm parts branches, higher population 'Marigoule' cultivar than other cultivars. However, invasion at early stage.