Abstract
European Grapevine Moth (EGVM), Lobesia botrana (Den. & Schiff.) (Lepidoptera: Tortricidae) is the key pest of grape in Turkey. The efficacy of Isonet LTT has been tested against L. botrana in comparison with registered Isonet L dispensers in Manisa and Canakkale, Turkey. One chemically treated vineyard was used to compare infestation levels for each location. By the emergence of the first EGVM adult, ∼320 Isonet LTT and 650 Isonet L dispensers/ha -including borders- were installed once a year. EGVM adults have been monitored in all plots by pheromone traps from the beginning of the flight until harvest. Infestation rates were compared. We indicated that both Isonet LTT and Isonet L dispensers showed excellent performance against the pest without additional treatment in 2015 and 2016. Average infestation rates of EGVM were below the threshold of 6%. EGVM infestation has been maintained at zero level by sprayings five and four times in the chemical treated vineyard in 2015 and 2016 in Manisa. Isonet LTT dispensers released 340 and 370 mg pheromone until harvest (19 August 2015 and 16 August 2016) in Manisa, whereas they released 360 and 410 mg of until harvest (27 August 2015 and 22 August 2016) in Canakkale, respectively.
Highlights
Turkey has more than 300 native grape varieties
In this study we use for the first time in Turkey the dispensers Isonet LTT, the new dispenser of Shin Etsu, testing their efficacy against European Grapevine Moth (EGVM) in comparison with Isonet L dispensers
Three each pheromone traps were installed in Isonet L and Isonet LTT plots whereas one each trap was installed in untreated control and chemical treated vineyards
Summary
Sultani Cekirdeksiz (Vitis vinifera L.) is the most important variety and its production is mainly undertaken in the western part of Turkey. Until 2000s, priority has been given to synthetic pesticide application for the control of EGVM. This moth shows three or four generations in the Aegean due to the favourable climatic conditions for the pest requiring frequent sprayings. Among them, Mating Disruption (MD) technique by Isonet-L and RAK 2R have been tested and registered against EGVM in Turkey in 2003 and 2012 [5, 6]. Grape growers preferring mating disruption have been subsidized by the Ministry of Food, Agriculture and Livestock since 2010 [7]. In this study we use for the first time in Turkey the dispensers Isonet LTT, the new dispenser of Shin Etsu, testing their efficacy against EGVM in comparison with Isonet L dispensers
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