Evaluating fungicides for controlling Cercospora leaf spot on sugar beet

Khan, Mohamed F. R.; Smith, L. J.

doi:10.1016/j.cropro.2004.06.010

Cited by 52 publications

(27 citation statements)

References 12 publications

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“…This fungicide class possesses a new mechanism of action consisting of inhibition of mitochondrial respiration by binding at the Q o site of cytochrome b. Inhibition of mitochondrial respiration is achieved by blocking the electron transport between cytochrome b and cytochrome c 1 which, in consequence, leads to a disruption of the energy cycle (3,4). Among the several pathogens that are efficiently controlled by strobilurin fungicides, C. beticola also is included, as has been shown by recent studies under both controlled environmental conditions (2,15) and field conditions (21). Among the several pathogens that are efficiently controlled by strobilurin fungicides, C. beticola also is included, as has been shown by recent studies under both controlled environmental conditions (2,15) and field conditions (21).…”

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confidence: 99%

Control of Benzimidazole- and DMI-Resistant Strains of Cercospora beticola with Strobilurin Fungicides

Karaoglanidis

Bardas

2006

Plant Disease

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The control efficacy of two new strobilurin fungicides, trifloxystrobin and pyraclostrobin, against Cercospora beticola isolates resistant and sensitive to sterol demethylation-inhibiting (DMI) fungicides and benzimidazole fungicides and the effects on evolution of resistance were tested in the current study. Control efficacy of strobilurin fungicides was measured using three C. beticola isolates, one DMI-resistant (DMIR), one benzimidazole-resistant (BENR), and one of wild-type sensitivity (WCB). Both pyraclostrobin and trifloxystrobin provided satisfactory control of all the three isolates used in the study, when applied at 5 μg ml-1 and very high levels of control when applied at 10 μg ml-1. Control was independent of the isolate sensitivity to benomyl and difenoconazole. In contrast, benomyl applied at 10 μg ml-1 failed to control sufficiently the benzimidazole-resistant isolate, whereas difenoconazole applied at either 5 or 10 μg ml-1 failed to provide satisfactory control of the DMI-resistant isolate of the pathogen. The effects of strobilurin fungicide applications on the evolution of resistance to benzimidazole and DMI fungicides were tested under field conditions in a 2-year experiment (2003 to 2004). Applications of either trifloxystrobin or pyraclostrobin provided high levels of disease control during both years of the study, whereas applications of either benomyl or difenoconazole provided a moderate control efficacy. Measurements of resistance frequencies to benomyl and to difenoconazole showed that successive applications of benomyl tended to select for high frequencies of benzimidazole-resistant phenotypes, whereas successive applications of difenoconazole tended to select for high frequencies of DMI-resistant phenotypes. In contrast, applications of either trifloxystrobin or pyraclostrobin prevented an increase of benzimidazole- or DMI-resistant phenotypes compared with the plots treated with benomyl or difenoconazole, respectively, and decreased frequency of resistance compared with untreated control plots.

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confidence: 99%

Control of Benzimidazole- and DMI-Resistant Strains of Cercospora beticola with Strobilurin Fungicides

Karaoglanidis

Bardas

2006

Plant Disease

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“…The level of disease control provided by penthiopyrad at the higher rates was similar to that provided by azoxystrobin, the industry standard. The QoI fungicides, such as azoxystrobin and pyraclostrobin, are being used on sugar beet for controlling Cercospora beticola (Khan and Smith, 2005), Erysiphe polygoni (Va nha) Weltzien (Karaoglanidis and Karadimos, 2006), and R. solani (Kiewnick et al, 2001). Rhizoctonia solani isolates collected from sugar beet fields showed Table 1 Effect of penthiopyrad (Vertisan, 20.6 EC) and azoxystrobin (Quadris, 22.9 F) fungicides applied as an 18-cm band on disease severity caused by R. solani.…”

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Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Liu

Khan

2016

Crop Protection

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“…In our experiment, the severity of ramularia leaf spot had impact on yield (r = −0.752**), sucrose content (r = −0.725**), content of potassium and alpha amino nitrogen (r = −0.626** and −0.642**) in the sugar beet roots. In USA, Khan and Smith (2005) established that a.i. pyraclostrobin caused increase of sugar beet root yield and sugar yield by 20 and 3.059 t ha -1 .…”

Section: And 7)mentioning

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Efficacy of fungicides in sugar beet crops

Avižienytė

Brazienė

Romaneckas

et al. 2016

Zemdirbyste-Agriculture

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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.

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Evaluating fungicides for controlling Cercospora leaf spot on sugar beet

Cited by 52 publications

References 12 publications

Control of Benzimidazole- and DMI-Resistant Strains of Cercospora beticola with Strobilurin Fungicides

Control of Benzimidazole- and DMI-Resistant Strains of Cercospora beticola with Strobilurin Fungicides

Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet

Efficacy of fungicides in sugar beet crops

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