The Performance of Some Walnut (J.regia) Cultivars in Bursa Conditions, Turkey

The present study aimed to evaluate the pomological and phenological traits, as well yield potential incidence of external defects some domestic ('Bilecik,' 'Mara? 12', 18', '?ebin,' '?en1') foreign walnut cultivars ('Chandler,' 'Fernette,' 'Fernor,' 'Howard,' 'Pedro,' 'Serr') grown in Bursa (northwest Turkey) conditions 2014-2020. first leafing was observed Mara? 12, Serr, ?ebin, 18 cultivars, while Fernette Fernor were last cultivars. female blooming period recorded longest (15 days), ?ebin (16 days) shortest Bilecik Serr (10 days). male flower Chandler, Fernette, Bilecik, (16-18 12 average per tree ranged between 1.87 kg (?ebin) 14.21 (Pedro). Walnut blight on 15.85%, sunburn 10.21%, codling moth 5.11%, anthracnose 3.23%, bird damage 2.35% fruits. sound nut percent from 40.06% (?en 1) 76.50% (Chandler). weight 9.91 g (Mara? 12) 16.27 1). Kernel varied 36.31% 53.56% 12). principal component analysis conducted distinguish suggests that most important factors could be reduced five components. results showed Fernor, Howard suitable for commercial cultivation conditions.