S. Mahunka szerk.: Folia Entomologica Hungarica 44/2. (Budapest, 1983)

Az Eurois occulta Linnaeus, 1758 újabb magyarországi példánya feromoncsapdából (Lepidoptera: Noctuidae) A new Hungarian specimen of Eurois occulta Linnaeus, 1758 from pheromone trap (Lepidoptera : Noctuidae) Az Eurois occulta Linnaeus, 1758 hazánkból eddig csak néhány példányban került elő, főként az ország északnyugati és északkeleti részéről (Sopron, Kőszeg, Pannonhalma, Fertőszentmiklós, Tolna, Budapest, Bükk, Zempléni-hg. ). A Törökbálint határában végzett feromoncsapdás vizsgálatok egyik eredményeként ennek a fajnak egy példányát sikerült begyűjteni. Az attraktáns három komponense (Z-ll-hexadecenyl-acetát; Z-9-tetradecenyl-acetát és Z-ll-hexadecenal) azonos a STECK és munkatársai (1982) által Kanadában azonositottal és a komponensek aránya is nagyban hasonlit; lehetséges, hogy a nagy elterjedésü faj földrajzilag izolált populációiban azonos vagy közel azonos az attraktáns összetétele. The Great Dart, Eurois occulta Linnaeus, 1758, (Noctuidae: Noctuinae), is a wide-spread species. Itt occurs in Canada and in the United States as well as in Europe and Asia (HAMPSON, 1903). In Hungary, it is regarded as a rare species. To our knowledge till now only a few specimens were collected at Sopron (KOVÁCS, 1956), Kőszeg (RÉZBÁNYAI, 1974) and in the Bükk Mountains (GYULAI, 1978); and single specimens at Fertőszentmiklós (coll. HERCZIG and coll. ERTI, respectively), Pannonhalma (KOVÁCS, 1953), Tolna (coll.ERTI), Budapest (coll.TTM), Zemplén Mountains (coll. BUSCHMANN), respectively, by traditional collecting methods. By field trappings with sex-attractant candidates as lures STECK & al. (1982) demonstrated in Canada that Z-ll-hexadecenyl acetate, Z-9-tetradecenyl acetate and Z-ll-hexadecenal in a ratio of 30:100:1 is a powerful sex attractant for E. occulta. In order to find lepidopterous sex attractants, field trappings were conducted using six synthetic compounds and their binary, ternary and quaternary mixtures. In the blends the amount of the compounds were 0.5, 5 and 100 ug, and almost all possible combinations were tested at Törökbálint (near Budapest, Hungary) in 1982. The traps were set up in a single row ca. 20 m apart from each other, on the border of a peach orchard and a mixed forest. The results of this experiment will be discussed in details elsewhere. We report here the capture of an E. occulta male by the trap baited with the mixture of Z-ll-hexadecenyl acetate, Z-9-tetradecenyl acetate and Z-ll-hexadecenal in a ratio of 100:100:5. Apart from that this finding is a further proof of the occurrence of E. occulta near Budapest. It is worth while to note that the specimen was caught by the trap containing the same three compounds in a very similar ratio as what was reported to be a sex attractant for this species in Canada by STECK & al. (1982). This strong similarity in the composition of the blends might indicate the identical, or at least rather similar response of the males of the two geographically distant populations to synthetic attractants. Irodalom (References): HAMPSON,G.F. (1902): Catalogue of the Lepidoptera Phalaenae in the British Museum IV. - London: 533-534. - KOVÁCS, L. (1953): A magyarországi nagylepkék és elterjedésük. - Folia ent.hung. 6: 76-164. - KOVÁCS, L. (1956): A magyarországi nagylepkék és elterjedésük. II. - Folia ent.hung. 9: 89-140. - RÉZBÁNYAI, L. (1974): A Kőszeg-hegység nagylepke faunája (Lepidoptera). - Folia ent.hung. 27: 139-182. - STECK, W., UNDERHILL, E.W. & CHISHOLM, M.D. (1982): Structure-activity relationships in sex attractants for North American noctuid moths. - J.chem.ecol. 8: 731-754. Dr. SZŐ CS Gábor és Dr. RONKAY László, Budapest