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Olive fruit fly - Bactrocera oleae (Diptera, Tephritidae) in Croatia ; damage in new milenium and advanced methods of control

The olive fruit fly, Bactrocera oleae Gmelin is the most significant olive fruit pest ; it has been topical to recent extensive researches. This pest has been either managed mainly by conventional methods of spraying entire trees with organophosphorus insecticides and by the bait spraying technique, or, on the other hand, not managed at all. Extensive researches have been carried out in the last decade, covering new abatement methods, primarily the "mass trapping" technique over larger surfaces, as well as testing of natural insecticides, repellants and ready-made baits. The Institute for Plant Protection performs organized monitoring and abatement of the B.oleae G. in all olive-growing areas of the Republic of Croatia. The tasks carried out during the period of the olive fruit fly activity include monitoring of its occurrence and population dynamics, assessment of current olive fruits infestation by the olive fruit fly preimaginal stages and collection of data on climate. The population dynamics was monitored by traps of the Chromotrap type (Isagro, S.p.A. Italy) with the addition of the sex pheromone (1, 7, dioxaspiro (5, 5) undecan), spirochaetal, ammonium salts (diammonium hydrogen phosphate and ammonium sulphate), and hydrolysed protein. Data on caught adults were collected weekly, while fruit infestation assessments were made every two weeks. It should be expressed that olive fruit fly is causing significant fruit loss continuously every year. Fruit infestation in the harvest time, depending on growing area and without any abatement treatment can be up to over 90% in the southern part of Dalmacija region. In the same time we should notice that some areas, such as whole archipelago of middle Dalmacija region, are not suitable for B. oleae development and infestation is usually much lower.

Olive fruit fly, Bactrocera oleae, infestation, mass trapping

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