Özet:

Anisandrus dispar Fabricius (Coleoptera: Curculionidae: Scolytinae) cultivate symbiotic fungus Ambrosiella hartigii Batra in the galleries found in sapwood of host trees for feeding. Therefore, controlling the symbiotic fungus means depriving A. dispar of a source of food. In the study, the efficacy of five doses (0.25x, 0.5x, 1.0x, 2.0x and 4.0x; where x is the field rate recommended by the manufacturer) of five fungicides including active ingredients of boscalid+kresoxim methyl, fluopyram+tebuconazole, penconazole, sulphur and tetraconazole used in hazelnut orchards against powdery mildew caused by Erysiphe corylacearum was evaluated against A. hartigii (TR-Ah-06 isolate) under laboratory conditions. The results of the study showed that all doses of the fungicides significantly inhibited the mycelial growth of A. hartigii when compared to the control (P<0.05). Among them, fluopyram+tebuconazole, penconazole and tetraconazole even at the lowest dose completely inhibited the mycelial growth of the fungus. However, the mycelial growth was reduced at the rates of 29.56-100% depending on the increasing doses of boscalid+kresoxim methyl. Sulphur inhibited the mycelial growth of A. hartigii at the rates of 78.57-100% depending on the increasing doses. In addition, the ED50, MIC and MFC values of fluopyram+tebuconazole, penconazole and tetraconazole were determined to be lower even than the 0.25x, which was the lowest dose at the experiment. The results showed that the fungicides, especially fluopyram+tebuconazole, penconazole and tetraconazole were effective against A. hartigii.

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