Efficacy of fungicides in sugar beet crops

Abstract

Cercospora and ramularia leaf spot are the most damaging fungal diseases of sugar beet in Europe. The aim of the current study was to evaluate the severity of fungal diseases and the efficacy of various fungicides and their doses in sugar beet crops in Lithuania. A short-term field experiment was carried out in 2012 and 2013 at Rumokai Experimental Station, Lithuanian Research Centre for Agriculture and Forestry on a moderately heavy loam HapliEpihypogleyic Luvisol (LVg-p-w-ha). Fungicides Impact (a.i. flutriafol), Opus (a.i. epoxiconazole), Artea (a.i. propikonazole + cyproconazole), Folicur (a.i. tebuconazole), Opera N (a.i. pyraclostrobin + epoxiconazole) were applied as a single application at the beginning of the disease occurrence (in August) and as a double application, with one spray at the beginning of the disease occurrence (in August) plus a second spray one month later (in September). The experimental results showed that the main fungal diseases in the sugar beet crops tested were Cercospora beticola and Ramularia beticola. Erysiphe betae was of minor severity. The application of fungicides significantly decreased the severity of cercospora and ramularia leaf spots by on average 19.8-81.8% and 71.8-91.8%, respectively. The most effective fungicides were Opus (a.i. epoxiconazole) and Impact (a.i. flutriafol). A single or double application of all the investigated fungicides had essentially the same effect. The most effective against powdery mildew was fungicide Opus, treated twice. Various active ingredients of the fungicides had insignificant effect on sugar beet yield and sucrose content in the roots. A single application of the fungicide Artea 0.5 L ha -1 (a.i. propiconazole + cyproconazole) and a double application Opus 1.0 L ha -1 (a.i. epoxiconazole) and Folicur 1.0 L ha -1 (a.i. tebuconazole) significantly decreased the content of impurities (potassium, sodium, alpha amino nitrogen) in the sugar beet roots compared with the untreated control treatment.

Enhancing the Ability of the Sugar Beet Plants to Control Powdery Mildew by Using some Chemical Fungicides

“…Fungicides are well known for their role in disease control (McGrath2004). Finally, Avižienytė et al (2016) found that the fungicide Opus is the most effective against powdery mildew when treated twice. Various active ingredients of the fungicides had insignificant effects on sugar beet yield and sucrose content in the roots.…”

New Approach to Control Sclerotium rolfsii Induced Sugar Beet Root Rots Disease by Trichoderma with Improved Sucrose Contents

“…Total soluble solids % was significantly enhanced when handling beet plants of Rhizoctonia and Trichoderma in contrast with the control of the 1st and 2nd growing seasons. Dovil‫כ‬ et al 34 observed the small impact of fungicides on sugar beet yield and sucrose quantity. The Trichoderma sp.…”

Fungicidal Protection as Part of the Integrated Cultivation of Sugar Beet: An Assessment of the Influence on Root Yield in a Long-Term Study

“…The application of foliar fungicides in integrated sugar beet cultivation beneficially affects not only the health of leaves and the leaf area index but also the yield and technological quality of roots [22][23][24]. Therefore, and also in view of the preference for choosing agricultural technologies that accord with the principles of integrated cultivation, long-term research was carried out on the impact that various fungicidal protection methods had on sugar beet root yields.…”