Efficacy of fungicides in control of downy mildew (Peronospora viciae) in pea crop

Abstract

During the 2016 growing season, biological efficacy of fungicides mixture propamocarb hydrochloride + chlorothalonil, metalaxyl-M + mancozeb and metalksil-M + chlorothalonil in the control of downy mildew in pea crop (Peronospora viciae), was investigated. The experiments were conducted in the localities of Sakule and Glogonj. The experiments were carried out as randomized block system in four replications EPPO (EPPO, 1997). Two fugicide applications were conducted , one at the beginning of flowering (BBCH 61) (1st treatment), and second at the stage when 10% of pods reached typical size (BBCH 71) (2nd treatment). Favorable conditions resulted in significant disease intensity on untreated plots, which amounted from 19.9 to 24.8% in the first, and from 32.3 to 44.5% in the second assessment. Fungicide mixture propamocarb-hydrochloride + chlorothalonil exhibited efficacy ranging from 92.7-93.9% at the first and from 85.5 to 91.9% at the second assessment. Fungicide metalaxyl-M + mancozeb, reached the efficacy of 93.1-95.4% at the first, and 86.3-93.2% at the second assessment, while the highest efficacy was achieved by a combination metalaxyl-M + chlorothalonil, which ranged from 86.9 to 100% at the first, and from 86.9 to 95.3% at the second assessment.

U toku 2016. godine, vršena su ispitivanja biološke efikasnosti fungicida na bazi kombinacije propamokarb-hidrohlorid + hlorotalonil, metalaksil-M + mankozeb i metalksil-M + hlorotalonil u suzbijanju prouzrokovača plamenjače (Peronospora viciae) u usevu konzumnog graška. Ogledi su izvedeni na lokalitetima Sakule i Glogonj, po tipu slučajnog blok sistema u četiri ponavljanja (EPPO, 2004, 2012). Fungicidi su primenjeni dva puta, i to kada su biljke bile u fenofazi početka cvetanja (BBCH 61) (prvo tretiranje) i kada je 10% mahuna dostiglo tipičnu veličinu (BBCH 71) (drugo tretiranje). Povoljni agrometeorološki uslovi, rezultirali su značajnom pojavom oboljenja u kontroli koja je iznosila 19,9- 24,8% u vreme prve, odnosno, 32,3-44,5% u vreme druge ocene efekata. Primenom kombinacije fungicida propamokarb-hidrohlorid + hlorotalonil, ostvarena je efikasnost u iznosu 92,7-93,9% u prvoj, odnosno, 85,5-91,9%, u drugoj oceni. Kombinacijom fungicida metalaksil-M + mankozeb, postignuta je efikasnost od 93,1-95,4% u prvoj i 86,3-93,2% u drugoj oceni, dok je najbolja efikasnost postignuta primenom fungicida na bazi kombinacije metalaksil-M + hlorotalonil, koja je iznosila 86,9-100% u prvoj, odnosno, 86,9-95,3% u drugoj oceni.