Cercospora beticola Tolerant to Triphenyltin Hydroxide and Resistant to Thiophanate Methyl in North Dakota and Minnesota

1998 ◽  
Vol 35 (1&2) ◽  
pp. 29-41 ◽  
Author(s):  
L.G. Campbell ◽  
G.A. Smith ◽  
H.A. Lamey ◽  
A.W. Cattanach
Keyword(s):  
North Dakota ◽  
Cercospora Beticola ◽  
Thiophanate Methyl

Survey and Screening of Benomyl Resistant Strains of Cercospora beticola in Minnesota and North Dakota

1986 ◽  
Vol 23 (3&4) ◽  
pp. 148-153 ◽  
Author(s):  
J.A. Percich ◽  
M.W. Hotchkiss ◽  
L.J. Nickelson
Keyword(s):  
North Dakota ◽  
Cercospora Beticola ◽  
Resistant Strains

scholarly journals Sensitivity of Cercospora beticola to fungicides in Slovakia

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).

scholarly journals Fluctuations in Number of Cercospora beticola Conidia in Relationship to Environment and Disease Severity in Sugar Beet

2009 ◽  
Vol 99 (7) ◽  
pp. 796-801 ◽  
Author(s):  
J. Khan ◽  
A. Qi ◽  
M. F. R. Khan
Keyword(s):  
Relative Humidity ◽  
Sugar Beet ◽  
North Dakota ◽  
Disease Severity ◽  
Leaf Spot ◽  
Forecasting Model ◽  
Cercospora Beticola ◽  
Disease Forecasting ◽  
Cercospora Leaf Spot ◽  
Average Temperature

Cercospora leaf spot, caused by Cercospora beticola, is the most damaging foliar disease of sugar beet in Minnesota (MN) and North Dakota (ND). Research was conducted to characterize the temporal progression of aerial concentration of C. beticola conidia in association with the environment and disease severity in sugar beet. In 2003 and 2004, volumetric spore traps were placed within inoculated sugar beet plots to determine daily dispersal of conidia at Breckenridge, MN, and St. Thomas, ND. Plots were rated weekly for disease severity. At both locations, conidia were first collected in early July 2003 and late June in 2004. Peaks of conidia per cubic meter of air were observed with maxima in late August 2003 and in early September 2004 at both locations. Peaks of airborne conidium concentration were significantly correlated with the average temperature of daily hours when relative humidity was greater than 87%. Weekly mean hourly conidia per cubic meter of air was significantly (P < 0.01) associated with disease severity during both years and across locations. This study showed that C. beticola conidial numbers may be used to estimate potential disease severity that, with further research, could be incorporated in a disease forecasting model to rationalize Cercospora leaf spot management.

scholarly journals Efficacy of Fungicides for Control of Sclerotinia Stem Rot of Canola

Plant Disease ◽  
2006 ◽  
Vol 90 (9) ◽  
pp. 1129-1134 ◽  
Author(s):  
C. A. Bradley ◽  
H. A. Lamey ◽  
G. J. Endres ◽  
R. A. Henson ◽  
B. K. Hanson ◽  
...  
Keyword(s):  
Brassica Napus ◽  
North Dakota ◽  
Sclerotinia Sclerotiorum ◽  
Untreated Control ◽  
Field Trials ◽  
Stem Rot ◽  
Sclerotinia Stem Rot ◽  
Application Timing ◽  
Thiophanate Methyl

Sclerotinia stem rot (SSR), incited by Sclerotinia sclerotiorum, causes yield reductions to canola (Brassica napus) grown in North Dakota and Minnesota. Field trials were conducted in North Dakota and Minnesota from 2000 to 2004 to evaluate the effect of foliar fungicides on SSR and canola yield. Levels of SSR varied among years and location. In general, fungicides that consistently reduced SSR incidence compared with an untreated control were azoxystrobin, benomyl, boscalid, iprodione, prothioconazole, tebuconazole, thiophanate-methyl, trifloxystrobin, and vinclozolin. Significant reductions in SSR incidence with fungicides did not always translate into differences in canola yield, however. Inconsistent results were observed with different timings of applications based on percent bloom. This indicates that application timing should be based on factors in addition to percent bloom.

Telepractice Brings Treatment to Rural North Dakota

ASHA Leader ◽  
2006 ◽  
Vol 11 (16) ◽  
pp. 16-17
Author(s):  
Bobbie Houn ◽  
Kolette Trottier
Keyword(s):  
North Dakota

Asthma Prevalence and Care for American Indian Youth in North Dakota

2003 ◽  
Author(s):  
Gregory Holzman ◽  
Kyle Muus ◽  
Barb Haugland ◽  
Marsha Blueshield ◽  
Cheryl Hefta ◽  
...  
Keyword(s):  
American Indian ◽  
North Dakota ◽  
Asthma Prevalence ◽  
American Indian Youth
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