Effect of Four Fungicides on Barley Net Blotch Caused by Drechslera teres

Abstract

The effect of four fungicides (benomyl, carbendazim, triadimefon and sulp hur), used in intensive barley cropping on the epidemiology of Drechslera teres f. maculata and f. teres, was investigated under a controlled environment. Two fungicides (benomyl and carbendazim) increased disease development, especially at the recommended field rate, sulphur had the same effect at lower concentrations and triadimefon promoted net blotch caused by D. teres f. teres. At the recommended field rate, carbendazim enhanced sporulation in the two pathogen forms, whereas benomyl and sulphur enhanced 14 sporulation only on the maculata form. The results showed that, under controlled conditions, most of the fungicides promotednet blotch development and that sporulation increased either as a result of the pathogen form or of the concentration of the active ingredient.

QTL mapping of fungicide sensitivity reveals novel genes and pleiotropy with melanization in the pathogen Zymoseptoria tritici

“…S2). This phenomenon was observed in previous studies using sublethal fungicide concentrations (Kenyon et al, 1997;Ramirez et al, 2004;Toubiarahme et al, 1995) but it could not be explained. We hypothesized that this pattern reflected additive effects of independently assorting alleles that neutralized the effects of propiconazole at the low concentration used in the experiment.…”

The repression and stimulation of growth of Erysiphe sp. on Rhododendron by fungicidal compounds

“…Examples include: iprodione increasing sporulation in Fusarium oxysporum f.sp. cepae in the absence of any effect on growth (Koriem et al, 1991); exposure to trifluralin increasing sporulation of Leptosphaeria maculans on rape stubble (Petrie, 1995); benomyl enhancing the growth of basidiomycete pathogens of turf (Smith et al, 1970); benomyl, carbendazim and sulfur increasing both the growth and sporulation of Drechslera teres (Toubia-Rahme et al, 1995) and trifluralin increasing the numbers of chlamydospores of Fusarium causing wilt of cotton (Tang et al, 1970).…”

Necrotrophic effector‐triggered susceptibility (NETS) underlies the barley–Pyrenophora teres f. teres interaction specific to chromosome 6H

“…NFNB is economically important in many barley-growing regions (Grewal et al, 2012;Murray and Brennan, 2010;Steffenson, 1997), producing yield losses of up to 40% with a moderate NFNB epidemic (Murray and Brennan, 2010;Steffenson, 1997). Cultural practices and fungicide application can be used to manage NFNB (Hysing and Wiik, 2013;Toubia-Rahme et al, 1995), but the most desirable method of controlling NFNB is the use of resistant cultivars. Resistance to NFNB has been reported in various barley germplasm lines and the genetics and chromosomal locations of resistance genes have been investigated (reviewed by Liu et al, 2011).…”