Abstract
The olive fruit fly, Bactrocera oleae (Gmelin) (Diptera: Tephritidae), is one of the most important olive pests in Turkey, as well as throughout the olive growing regions in the world. The aims of the study are to determine infestation rate of B. oleae and to asses the effects of pest infestation on yield, hundred fruit weight, maturation index, acidity and fatty acid composition of olive oil at different harvest times. This study was carried out in five selected olive orchards in Kucukkuyu-Ayvacik (Canakkale), representing the Edremit Gulf Region, where aerial spraying is not being applied. Only trees representing cv. Ayvalik, the main cultivars of the region, were selected for the experiment. Adults were monitored with yellow sticky traps from the beginning of July to the end of December in 2005. Samples were collected at five different dates in the five orchards. The results showed that the level of B. oleae adults population was low during July and August and reached the highest level at the end of October. The infestation rates of B. oleae at all harvesting dates were observed parallel to the adult population densities in all five orchards. The puncture rate considerably increased after mid November, therefore, early harvest definitely contributed to the preventing the fruit from B. oleae infestation. There were no statistical differences in hundred fruit weight among different harvest times. Oil yield increased rapidly until 10th of November. After that time, the increase rates gradually stopped and there were no statistical differences between oil yields. Therefore, fruit harvest should be carried out starting from mid-November to obtain the highest oil yield and avoid higher infestation rates. It is obvious that the olive oil acidity is affected by B. oleae infestation but in presented study, the results haven’t complied with this due to a considerable percentage of fly-damaged fruits that would cause high acidity dropped prior to early November. The fatty acid composition was affected by olive ripening. Although it was effectively proved through previous research on the fatty acid composition, the effects of B. oleae infestation haven’t been determined because the analysis was carried out on the fruits hanging on the trees as suggested by International Olive Oil Council (IOOC). According to the results the harvest should be done when olives are turning purple or have purple skin for minimizing the damage caused by B. oleae. Regarding to the above criteria, the suitable harvest time was found as the mid of November, when fruit maturation index is between 2.5 and 3.5. Results indicate that the B. oleae infestation could be significantly reduced by the implementation of early harvest.
Zusammenfassung
Die Olivenfliege Bactrocera oleae (Gmelin) (Diptera: Tephritidae) ist in der Türkei und den anderen Oliven anbauenden Regionen der Welt einer der bedeutendsten tierischen Schaderreger der Olive. Die Ziele dieser Untersuchung bestanden in der Erhebung der Befallsraten von B. oleae sowie der Wirkungen des Befalls auf Ertrag, Hundert-Frucht-Gewicht, Reifegrad, Säuregrad und Fettsäure-Zusammensetzung des Olivenöls zu verschiedenen Ernteterminen. Die Untersuchung wurde in fünf für die Edremit-Golf-Region repräsentativen Olivenhainen in Kucukkuyu-Ayvacik (Canakkale), in denen keine Insektizidspritzungen erfolgten, ausschließlich an der in der Region dominierenden Olivensorte Ayvalik durchgeführt. Die Population adulter Olivenfliegen wurde mittels gelber, leimbestrichener Fliegenfänger von Anfang Juli bis Ende Dezember 2005 überwacht. Die Proben wurden an allen fünf Standorten an fünf verschiedenen Terminen genommen. Die Populationsdichten adulter Olivenfliegen waren zwischen Juli und August noch relativ gering und erreichten das Maximum Ende Oktober. Die Befallsraten der Olivenbäume und die Populationsdichten adulter B. oleae wurden gemeinsam an allen Ernteterminen und Standorten erhoben; sie nahmen nach Mitte November erheblich zu. Der Erntetermin hatte dagegen keinen Einfluss auf das Hundert-Frucht-Gewicht. Der Ölertrag stieg signifikant bis zum Erntetermin 10. November und blieb danach konstant. Die Olivenernte sollte daher zur Erzielung des höchsten Ölertrags bei vergleichsweise geringem Befall ab Mitte November erfolgen. Obwohl der Säuregrad des Öls offenbar durch einen Befall mit B. oleae erhöht wird, konnten wir dies nicht feststellen, weil ein erheblicher, durch die Olivenfliege ausgelöster Fruchtfall bereits vor Anfang November erfolgt war. Die Fettsäure-Zusammensetzung hängt vom Reifegrad der Oliven ab. Obwohl dies schon längere Zeit bekannt ist, konnte der Einfluss eines Befalls mit der Olivenfliege nicht untersucht werden, weil die vom International Olive Oil Council (IOOC) empfohlene Analysenmethode nur mit am Baum hängenden Früchten durchgeführt wird. Zur Minimierung von Ertragsschäden durch die Olivenfliege sollte die Ernte daher erfolgen, wenn die Oliven violett zu werden beginnen oder bereits sind. Dies ist nach unseren Ergebnissen Mitte November bei einem Reifeindex zwischen 2,5 und 3,5 der Fall. Die Ergebnisse zeigen, dass ein Befall mit B. oleae durch eine frühe Ernte signifikant vermindert werden kann.
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Literature
Ajana, H., A. El Antari, A. Hafidi, 1998: Fatty acid and sterol evolution during the ripening of olives of the Moroccan Picholine cultivar. Grasas Aceites 49, 405–410.
Anonymous, 1998: SPSS 8.0 for Windows Brief Guide. 1st edition. SPSS, Prentice Hall, Glenview, IL, USA.
Anonymous, 2001: Trade Standard Applying to Olive Oil and Olive Pomace Oil. COI/T.15/NC No. 2/Rev. 10. International Olive Oil Council, Madrid, Spain.
Anonymous, 2002: EEC Regulation 2002 no. 796 of 6 May 2002 on change. E.C. Regulation no 2568/91. Off. J. Eur. Commun. L 128, 8–28.
Anonymous, 2003: Devlet Istatistik Enstitüsü Verileri. Ankara, Turkey (www.die.gov.tr).
Ayoutantis, A.-J., E.-D. Pelekassis, L.-C. Argyriou, P.A. Mourikis, L.-E. Tsacas, 1954: Rapport sur le travaux experimentaux de lutte contre le Dacus a Rovies (Eubee) pendant 1’annee 1953: Ann. Inst. Phytopathol. Benaki 8, 2–75.
Beltran, G., C. Del Rio, S. Sanchez, L. Martinez, 2004: Seasonal changes in olive fruit characteristics and oil accumulation during ripening process. J. Sci. Food Agric. 84, 1783–1790.
Bento, A., J.-E. Cabanas, J.-A. Pereira, 2004: Control of the olive fruit fly, Bactrocera oleae (Gmel.), in organic agriculture. 5th International Symposium on Olive Growing, 27 September-2 October, Izmir, Turkey, 245.
Cak.ic.i, M., M. Kaya, 1982: Ege Bölgesi’nde Zeytin sinegi (D. oleae Gmel.)’nin neden oldugu ürün kaybi ve ekonomik sava ş e şigi üzerine araştirmalar. Bornova Bölge Zirai Mücadele Araştirma Enstitüsü A.105.024 No’lu Proje Raporu.
Crovetti, A., 1996: Enciclopedia mundial del olivo. Conceil Oleicole International, Madrid, Spain.
Fletcher, B.-S., S. Pappas, E. Kapatos, 1978: Changes in the ovaries of olive flies (Dacus oleae (Gmelin)) during the summer and their relationship to temperature, humidity and fruit availability. Ecol. Entomol. 3, 99–107.
Frias, L., M. Hermoso, M. Uceda, M.P. Llavero del Pozo, A. Jimenez, 1991: Analistas de Laboratorio de Almazara. Apuntes no. 6/91. Junta de Andalucia, Sevilla, Spain.
Fytizas, E., P.-A. Mourikis, 1970: Review of olive-fly ecology in relation to the sterile-male technique. Proceedings of Sterile- Male Technique for Control of Fruit Flies, 1–5 September 1969, Vienna, Austria, pp. 131–139.
Gumusay, B., U. Ozilbey, G. Ertem, A. Oktar, 1990: Studies on the susceptibility of some important table and oil olive cultivars of Aegean region to olive fly (Dacus oleae Gmel.) in Turkey. ACTA HORT. 286, 359–362.
Katsoyannos, P., 1992: Olive pests and their control in the Near East. FAO Plant Production and Protection Paper No. 115. Food and Agriculture Organization of the United Nations, Rome, Italy.
Lavee, S., 1986: Olive. In: S.-P. Monselise (ed.): Handbook of Fruit Set and Development, pp. 261–274. CRC Press, Boca Raton, FL, USA.
Mete, N., O. Cetin, 2006: Zeytinin botanik smiflandmlmasi ve bölgelere göre yerli zeytin çeşitlerimiz. In: Zeytincilik Araştirma Enstitüsü Yay. No. 61, Zeytin Yetiştiriciliği, pp. 15–27.
Orphanidis, P.S., 1967: The problem Dacus of the olive tree. A brief study of the methods of its control and of the current possibilities and perspectives. Nea Agrotiki Epitheorisis No. 247, 1–14.
Pala, Y., A. Nogay, E. Damgaci, M. Altin, 2001: Zeytin Bahçe- lerinde Entegre Mücadele Teknik Talimati, T.C. Tarim ve Köyişleri Bakanligi Tarimsal Araştirmalar Genel Müdür- lügü, Bitki Sagligi Araştirmalari Daire Başkanligi, Ankara, Turkey.
Patanita, M.-I., A. Mexia, 1994: Loss assessment due to Prays oleae Bern. and Bactrocera oleae Gmelin in Moura’s region (Portugal) (http://pubol.ipbeja.pt/Artigos/Italia.htm).
Pereira, J.-A., M.-R. Alves, S. Casal, M.B.P.P. Oliveira, 2004: Effect of olive fruit fly infestation on the quality of olive oil from cultivars Cobrançosa, Madural and Verdeal Transmontana. ITAL. J. FOOD SCI. 16, 355–365.
Petacchi, R., A. Minocci, 2002: Olive fruit fly control methods in sustainable agriculture. Acta Hort. 586, 841–844.
Shulman, Y., S. Lavee, 1979: Fruit development and maturation as affected by treatments of auxin. Riv. Ortoflorofrutticoltura Ital. 63, 31–40.
Tamendjari, A., F. Angerosa, M.-M. Bellal, 2004: Influence of Bactrocera oleae infestation on olive oil quality during ripening of chemlal olives. ITAL. J. FOOD SCI. 16, 343–354.
Tedeschini, J., F. Thomaj, M. Bregasi, D. Panojoti, B. Ferraj, M. Bacaj, C. Pitts, D. Pfeiffer, L. Ferguson, 2003: Effect of harvest timing on olive fly infestation and olive oil yields and quality. 1st European Meeting of the IOBC/WPRS Study Group “Integrated Control in Olives” 29–31 May 2003, Maich-Chania Crete, Hellas.
Tombesi, A., 1994: Olive fruit growth and metabolism. Acta Hort. 356, 225–232.
Tzanakakis, M.-E., 2003: Seasonal development and dormancy of insects and mites feeding on olive: A review. Neth. J. Zool. 52, 87–224.
Uceda, M., L. Frias, 1975: Harvest dates. Evolution of the fruit oil content, oil composition and oil quality. Proc. Segundo Seminario Oleicola Internacional, Cordoba, Spain, 6 Oct 1975, 125–130.
Uceda, M., M. Hermoso, 2001: La calidad del aceite de oliva. In: D. Barranco, R. Fernandez-Escobar, L. Rallo (eds.): El Cultivo del Olivo, 4th edition, pp. 589–614. MundiPrensa, Junta de Andalucia, Madrid, Spain.
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Topuz, H., Durmusoglu, E. The effect of early harvest on infestation rate of Bactrocera oleae (Gmelin) (Diptera: Tephritidae) as well as yield, acidity and fatty acid composition of olive oil. J Plant Dis Prot 115, 186–191 (2008). https://doi.org/10.1007/BF03356256
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DOI: https://doi.org/10.1007/BF03356256