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Drosophila suzukii (Matsumura, 1931) (Diptera: Drosophilidae) is native to East Asia and invasive on the European and American continents. The first records in both Europe and the United States were in 2008. Since that year, it has widely moved across these continents. As D. suzukii females lay eggs in healthy ripening fruits of several species, particularly in small soft fruits and berries, the species causes agricultural damage. The soft thin-skinned fruit pest, identified as D. suzukii, has been found in Erzurum, Turkey, where damaged strawberry crops were observed and cultured in the middle of August and September 2014. Initially, 2 adults, 3 pupae, and several larvae were observed. Emergence of male and female adults continued for 10 more days. Here we report the first finding of D. suzukii in Turkey.

This research was conducted to identify promising native walnut (Juglans regia) trees growing wild in the Çoruh Valley, north-eastern Anatolia, Turkey. The research material consisted of uncultivated walnut trees. From c. 39 000 trees growing in the region, 20 genotypes with superior yield and fruit characteristics were selected and evaluated. These genotypes were resistant to anthracnose and early autumn-late spring frost injuries. The ranges of average fruit characteristics determined for the selected genotypes were: 85-100% terminal fruitfulness; 40-63% lateral fruitfulness; 2.24-3.20 fruits per terminal shoot; 1.45-2.15 fruits per lateral shoot; 9.07-16.01 g nut in shell weight; 5.00-7.37g kernel weight; 45.66-67.14% kernel ratio; and 0.58-1.53mm shell thickness. The best genotypes were CVWS 13, 46, 138, 150 and 193. These types had thinner shell (0.58mm, CVWS 13), heavier kernel (7.37g, CVWS 138), and more lateral fruitfulness (63% CVWS 193 and 60% CVWS 46 and CVWS 150). Selected walnut genotypes in the Çoruh Valley will be used for further breeding purposes in terms of yield capacities, nut characteristics, and cold hardiness.

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