Determine to the effects of different insecticide treatments on pest populations, damages and fruit yield in Gemli̇k cv. olive orchards

Thesis Type: Postgraduate

Institution Of The Thesis: Bursa Uludağ University, FEN BİLİMLERİ ENSTİTÜSÜ, Turkey

Approval Date: 2014

Thesis Language: Turkish

Student: Gamze Mertoğlu



In this study, in the 2013-2014 years, Bursa province Görükle Campus (Nilüfer) Keramet Village (Orhangazi) and Ortaköy Village (Orhangazi) were found executed in Gemlik variety of olive groves. Olive major pests, Olive moth Prays oleae (Bernard) (Lepidoptera: Yponomeutidae), Olive fruit fly, Bactrocera oleae (Gmelin) (Diptera: Tephritidae) and Olive psyllid Euphyllura phillyreae (Foester) (Hemiptera: Psyllidae), against non-target organisms and humans reported to be less harmful than a juvenile hormone analogue pyriproxyfen and the chitin synthesis inhibitors diflubenzuron, general contact insecticide synthetic pyretroid deltamethrin and with a neonicotinoid of the same insecticide (thiacloprid), formulation are used. The population of pests in olive prominent of insecticides used to determine the effect of level of damage rates, yield and quality (grit size) effects were studied for two years. Made by spraying for olive moth, flower and fruit generation, diflubenzuron+deltamethrin (Dimilin+Decis) for flower generation, thricloprid+deltamethrin (Proteus) has been found effective for fruit generation. Pyriproxyfen (Admiral) was more effective for olive moth eggs and larvae. Diflubenzuron+deltamethrin (Dimilin+Decis) were effective for the olive psyllid. As a result, when the control plot compared with plots by any spraying of insecticide, while reducing populations and damages of pests with both insecticide treatments, there was no significant difference between the applications. In order to determine the critical point for spraying, 9th and 10th phenological periods of olive and 15th and 16th phenological periods of olive for the flower generation and the fruit generation of the olive moth, respectively, has been identified as critical phenological periods. Compared with the spraying plots, although it has been obtained significantly less olive fruit in the control plots, the grain size in this polt was larger than spraying ones. When the applied pyriproxyfen, it has caused a delay in the development of olives. The highest yields and the grain size olives in the both years were taken from the plots spraying with deltamethrin + thricloprid (Proteus, Bayer).