Fungicides and insecticides applied to pelleted sugar-beet seeds — I. Dose, distribution, stability and release patterns of active ingredients

Different seed storage methods, varying in storage temperature, moisture and/or oxygen content, were applied to commercial sugar beet seed lots from four breeding companies. After storage for 10–11 months, germination of the seed was tested in the laboratory (cold test, 10°C). In addition, the contents of active ingredients (fungicides and insecticide) were analyzed and compared with the initial contents before storage. Based on these results, a selection of the most promising storage methods was made to test plant emergence in a field experiment. This research was performed in 2015/16 and in 2016/17. In both years, two storage treatments outperformed the others: these were storage in a closed jar with the addition of moisture absorber (i.e. silica gel) at room temperature and storage at –18°C in a closed plastic bag. Using these two storage methods, seed vigour and contents of active ingredients were comparable to those in seed that had not been stored for one year. Based on the results from this study, the advice to growers for a successful storage of residual sugar beet seed was adjusted in 2017, after including some practical guidelines and considerations.

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QoI Resistance in Sugar Beet Powdery Mildew (Erysiphe betae) in Scandinavia

Plant Health Progress ◽

10.1094/php-01-19-0004-br ◽

2019 ◽

Vol 20 (3) ◽

pp. 179-179 ◽

Cited By ~ 1

Author(s):

Thies Marten Heick ◽

Anne Lisbet Hansen ◽

Annemarie Fejer Justesen ◽

Lise Nistrup Jørgensen

Keyword(s):

Powdery Mildew ◽

Sugar Beet ◽

The United States ◽

Field Trials ◽

Active Ingredients ◽

Management Measures ◽

Real Risk ◽

Erysiphe Betae ◽

European Union Legislation ◽

Qoi Resistance

Powdery mildew caused by Erysiphe betae is one of the major fungal diseases in sugar beet in Denmark and Sweden. Frequent applications of fungicides mitigate the risk of powdery mildew epidemics and, consequently, reduce yield losses conferred by the disease. So far, mixtures of quinone outside inhibitors (QoIs) and triazoles have provided good efficacy against E. betae in field trials and common farming practice. However, development of fungicide resistance is a real risk, because only a limited number of active ingredients are available for the control of powdery mildew in sugar beet, and several other active ingredients are expected to be banned following reevaluation when the most recent European Union legislation is implemented. The G143A mutation associated with QoI resistance has been previously found in the United States. In this brief, its presence in Europe is reported for the first time. The current finding strongly encourages the adoption of anti-resistance strategies that minimize the spread of QoI resistance in sugar beet powdery mildew. Those strategies should be based on integrated pest management measures, including disease monitoring, the use of resistant cultivars, and the use of biological products. A sole reliance on QoI fungicides for sugar beet powdery mildew control should be avoided.

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Examination of Possibilities for Increasing Sugar Content

Acta Agraria Debreceniensis ◽

10.34101/actaagrar/10/3496 ◽

2003 ◽

pp. 202-206

Author(s):

Lajos Varga

Keyword(s):

Sugar Beet ◽

Low Cost ◽

Sugar Content ◽

Sugar Yield ◽

Active Ingredients ◽

Foliar Fertilization ◽

Small Block ◽

Block Trial

The result of sugar beet production is highly effected by the quality and the yield. Those agricultural techniques are very important which can be applied at low cost to improve these parameters. Such an opportunity is to increase sugar yield by foliar fertilization with nutrients and by treatment with bioactive fungicides.In my small block trial I examined the effect of the magnesium and strobilurin active ingredients in different combinations and at different application times on the quality and the yield of sugar beet.I found that there was a signifficant increase in sugar content on that blocks which were treated with a bioactive ingredient combined with magnesium in the middle of July and on those which were sprayed with bioactive ingredient in August.

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Sensitivity of Cercospora beticola to fungicides in Slovakia

Acta fytotechnica et zootechnica ◽

10.15414/afz.2020.23.03.147-154 ◽

2020 ◽

Vol 23 (3) ◽

pp. 147-154

Author(s):

Kamil Hudec ◽

Milan Mihók ◽

Tibor Roháčik ◽

Ľudovít Mišľan

Keyword(s):

Growth Rate ◽

Sugar Beet ◽

Mode Of Action ◽

Fungicide Resistance ◽

Cercospora Beticola ◽

Active Ingredients ◽

Thiophanate Methyl ◽

Resistant Strains ◽

Pathogen Occurrence ◽

The One

The fungus Cercospora beticola Sacc. is the one of the most important pathogens on the sugar beet. The frequent application of fungicides with the same mode of action increase a risk of development of resistant strains of the pathogen. Occurrence of C. beticola resistant strains has been never researched in Slovakia. In this work, C. beticola isolates were collected from 10 localities of Slovakia and analysed for fungicide resistance in laboratory conditions. Nine fungicides with different mode of action were tested – trifloxystrobin + cyproconazole, kresoxim-methyl + epoxiconazole, azoxystrobin + cyproconazole, thiophanate-methyl + tetraconazole, thiophanate-methyl, prochloraz + propiconazole, picoxystrobin, tetraconazole, and difenoconazole. The results confirmed, that occurrence of fungicide resistance in C. beticola population was established in Slovakia. Different criteria of assessment of fungicide resistance (based on EC50 and on growth rate – inhibition percentage) showed slightly different results, but both criteria confirmed resistant C. beticola strains to thiophanate-methyl, picoxystrobin and difenoconazole. Fields with higher frequency of application of these fungicides significantly supported the development of resistant strains. Assessment of any C. beticola strains have not confirmed reduced sensitivity to active ingredients tetraconazole and prochloraz + propiconazole. The lowest level of risk of fungicide resistance was confirmed in the locality Oslany. It is very important to focus on anti-resistant strategy and reduce of using fungicides on localities, where the occurrence of resistant C. beticola strains was confirmed – Dolné Saliby (thiophanate-methyl and picoxystrobin) and Senec (picoxystrobin and difenoconazole).

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