INFLUENCE OF DISEASES ON ONION YIELD AND QUALITY

Bolesti su vrlo značajan negativni čimbenik u proizvodnji luka koji značajno umanjuje prinos i kakvoću lukovica. U radu su prikazani rezultati istraživanja utjecaja fungicidnih tretmana na razvoj bolesti te njihov utjecaj na prinos i kakvoću luka temeljem pokusa postavljenih na proljetnom luku 2011. godine te ozimom luku u 2012. godini na PIK Vinkovci (lokacija Čeretinci). Pokus je postavljen u dvije varijante zaštite fungicidima – standardna zaštita koju provodi PIK Vinkovci i zaštita prema preporuci distributera fungicida. Treća varijanta u pokusu obuhvaćala je standardnu zaštitu uz dodatak biostimulatora s ciljem utvrđivanja utjecaja biostimulatora na prinos i njegovu kakvoću. Rezultati istraživanja pokazali su da je u vrućoj i sušnoj godini pojava bolesti vrlo slaba te da su, u takvim uvjetima, obje ispitivane varijante zaštite fungicidima bile učinkovite. Godine tijekom kojih je obavljeno istraživanje bile su iznimno nepovoljne za infekcije i razvoj bolesti te istraživanja svakako treba nastaviti kako bi se utvrdio utjecaj bolesti na prinos i kakvoću luka kao i učinkovitost različitih varijanti zaštite i u godinama koje su povoljne za razvoj bolesti. Istraživanja su potvrdila da primjenom biostimulatora postižemo veće prinose bolje kakvoće.Diseases are very important factor in onion production which negatively affects and significantly decreases yield and the quality of bulbs. This paper presents results of fungicidal treatment influence on diseases development and their effect on yield and the quality of bulbs, based on an experiment with spring onion in 2011. and winter onion in 2012. in „PIK Vinkovci“ (location Čeretinci). Experiment was set up in two different arms of fungicidal protection – standard care produced by „PIK Vinkovci“ and care according to fungicidal distributer recommendation. Third arm in experiment included standard care with biostimulator added with purpose of determining the efect that biostimulator has on yield and the quality of bulbs. The results of this research have shown that diseases incidence was more often during warm and dry year and that, in such conditions, both versions of fungicidal protection were effective. Research was conducted during years which were very unfavorable for infections and diseases development, thus should be continued to evaluate the impact of diseases on yield and the quality of bulbs as well as effectiveness of various care versions also during years which are favorable for diseases development. Research have confirmed that biostimulator utilization ensures more yield with higher quality