10.31727/gzb Glasnik Zaštite Bilja 0350-9664 2584-3265 Zadružna štampa Zadružna štampa Maksimirska 132, Zagreb, Hrvatska info@zadruzna-stampa.hr www.zastitabilja.com.hr 10.31727/gzb.44.6.4 Izvorni znanstveni članak Research-article Suzbijanje pjegavosti šećerne repe – primjer iz prakse Control of Cercospora leaf spot – an example of disease management practices Varga Ivana ivana.varga@fazos.hr 1 Hanžek Danijela 1 Zebec Vladimir 1 Antunović Manda 1 Fakultet agrobiotehničkih znanosti, Sveučilište J. J. Strosmyera u Osijeku, Hrvatska 14 12 2021 44 6 32 41 24 11 2020 5 3 2021 Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Ovo je članak s otvorenim pristupom distribuiran pod uvjetima licence Creative Commons Attribution, koji dopušta neograničenu upotrebu, distribuciju i reprodukciju u bilo kojem mediju, pod uvjetom da se izvorno djelo pravilno citira. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Cilj ovog rada bio je analizirati provedenu zaštitu u suzbijanju pjegavosti lista šećerne repe (Cercospora beticola Sacc.) te prikazati ostvaren prinos i kvalitetu šećerne repe u petogodišnjem razdoblju (2016. – 2020.). U analiziranom razdoblju prvo tretiranje fungicidom provodilo se zbog prevencije već u prvoj ili drugoj dekadi lipnja. Ovisno o vegetacijskoj sezoni, zaštita je provedena u 4 (2016. – 2018.) ili 5 navrata (2019. i 2020.). Razmak između tretiranja je bio između 14 i 20 dana. Zadnje tretiranje provelo se krajem prve dekade kolovoza. U svakom tretiranju fungicidima korištena je kombinacija organskih sistemičnih fungicida i sredstava na bazi bakra (bakreni oksiklorid) što se pokazalo uspješnim u očuvanju lisne rozete. Prinos korijena šećerne repe iznosio je prosječno 74,4 t/ha, a sadržaj šećera u korijenu 15,86%. Najveći prinos korijena bio je 2016. godine (80,8 t/ha), kada je zaštita od gljivice Cercospora beticola bila provedena u 4 navrata. Najmanji prinos i sadržaj šećera ostvaren je 2019. godine, (65,2 t/ha i 12,24%), jer je nakon tuče u srpnju šećerna repa retrovegetirala.

The aim of this study was to assess the applied fungicides in the control of Cercospora leaf spot, CLS (Cercospora beticola Sacc.), and to analyse sugar beet yields and quality in the five-year period (2016- 2020). In the analysed period, the first preventive fungicide application was carried out in the first or second decade of June. Regardless of the growing season, treatments were carried out on 4 (2016 - 2018) or 5 treatments (2019 and 2020). The interval between treatments was from 14 to 20 days. The last treatment was carried out at the end of the first decade in August. A combination of organic systemic fungicides and copper-based agents (copper oxychloride) was used in each treatment, which has been shown to be successful in preserving sugar beet leaves free of CLS. The average yield of sugar beet root was 74.4 t/ ha, while sugar content in the root 15.86%. The highest root yield was achieved in 2016 (80.8 t/ha), when protection against CLS was carried out on 4 applications. The lowest yield and sugar content were achieved in 2019 (65.2 t/ha and 12.24%), because after the hail in July, re-growth of sugar beet leaves occured.

 Cercospora beticola šećerna repa prinos kvaliteta vremenske prilike Cercospora beticola sugar beet yield quality weather conditions