Variability in potato late blight severity and its effect on tuber yield in Uganda

2001 ◽  
Vol 9 (1) ◽  
Author(s):  
J. Mukalazi ◽  
E. Adipala ◽  
T. Sengooba ◽  
J. J. Hakiza ◽  
M. Olanya ◽  
...  
Keyword(s):  
Late Blight ◽  
Tuber Yield ◽  
Potato Late Blight

scholarly journals Host Diversity Can Reduce Potato Late Blight Severity for Focal and General Patterns of Primary Inoculum

2000 ◽  
Vol 90 (12) ◽  
pp. 1307-1312 ◽  
Author(s):  
K. A. Garrett ◽  
C. C. Mundt
Keyword(s):  
Late Blight ◽  
Tuber Yield ◽  
Statistical Significance ◽  
Experimental System ◽  
Potato Late Blight ◽  
Management Tools ◽  
Host Diversity ◽  
Progress Curve ◽  
Single Genotype ◽  
Diversity Effects

The use of host diversity as a tool for management of potato late blight has not been viewed as promising in the past. But the increasing importance of late blight internationally has brought new consideration to all potential management tools. We studied the effect of host diversity on epidemics of potato late blight in Oregon, where there was little outside inoculum. The experimental system consisted of susceptible potato cv. Red LaSoda and a highly resistant breeding selection, inoculated with local isolates of US-8 Phytophthora infestans. Potatoes were grown in single-genotype plots and also in a mixture of 10 susceptible and 26 resistant potato plants. Half of the plots received inoculation evenly throughout the plot (general inoculation) and half received an equal quantity of inoculum in only one corner of the plot (focal inoculation). The area under the disease progress curve (AUDPC) was greater in single genotype stands of susceptible cv. Red LaSoda inoculated throughout the plot than with stands inoculated in one focus. The host-diversity effect on foliar late blight was significant in both years of the investigation; the AUDPC was reduced by an average of 37% in 1997 and 36% in 1998, compared with the mean disease level for the potato genotypes grown separately. Though the evidence for influence of inoculum pattern on host-diversity effects was weak (P = 0.15), in both years there was a trend toward greater host-diversity effects for general inoculation. Statistical significance of host-diversity effects on tuber yield and blight were found only in one of the two years. In that year, tuber yield from both the resistant and susceptible cultivar was increased in mixtures compared with single genotype stands and tuber blight was decreased in mixtures for susceptible cv. Red LaSoda.

Discerning strains of Phytophthora infestans the causative agent of potato late blight by SSCP analysis of virulence genes

2018 ◽  
Vol 34 (6) ◽  
pp. 4-11
Author(s):  
V.K. Chizhik ◽  
◽  
E.A. Sokolova ◽  
V.V. Martynov ◽  
M.A. Kuznetsova ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Causative Agent ◽  
Virulence Genes ◽  
Potato Late Blight ◽  
Sscp Analysis

Climate change may have limited effect on global risk of potato late blight

2014 ◽  
Vol 20 (12) ◽  
pp. 3621-3631 ◽  
Author(s):  
Adam H. Sparks ◽  
Gregory A. Forbes ◽  
Robert J. Hijmans ◽  
Karen A. Garrett
Keyword(s):  
Climate Change ◽  
Late Blight ◽  
Potato Late Blight ◽  
Global Risk ◽  
Limited Effect

scholarly journals Profiling the Secretome and Extracellular Proteome of the Potato Late Blight PathogenPhytophthora infestans

2014 ◽  
Vol 13 (8) ◽  
pp. 2101-2113 ◽  
Author(s):  
Harold J. G. Meijer ◽  
Francesco M. Mancuso ◽  
Guadalupe Espadas ◽  
Michael F. Seidl ◽  
Cristina Chiva ◽  
...  
Keyword(s):  
Late Blight ◽  
Potato Late Blight ◽  
Extracellular Proteome

scholarly journals Modeling of Yield Losses Caused by Potato Late Blight on Eight Cultivars with Different Levels of Resistance to Phytophthora infestans

Plant Disease ◽  
2012 ◽  
Vol 96 (7) ◽  
pp. 935-942 ◽  
Author(s):  
Toky Rakotonindraina ◽  
Jean-Éric Chauvin ◽  
Roland Pellé ◽  
Robert Faivre ◽  
Catherine Chatot ◽  
...  
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Relative Yield ◽  
Weather Conditions ◽  
Potato Late Blight ◽  
Yield Losses ◽  
Predictive Quality ◽  
Wide Range ◽  
Cultivar Susceptibility

The Shtienberg model for predicting yield loss caused by Phytophthora infestans in potato was developed and parameterized in the 1990s in North America. The predictive quality of this model was evaluated in France for a wide range of epidemics under different soil and weather conditions and on cultivars different than those used to estimate its parameters. A field experiment was carried out in 2006, 2007, 2008, and 2009 in Brittany, western France to assess late blight severity and yield losses. The dynamics of late blight were monitored on eight cultivars with varying types and levels of resistance. The model correctly predicted relative yield losses (efficiency = 0.80, root mean square error of prediction = 13.25%, and bias = –0.36%) as a function of weather and the observed disease dynamics for a wide range of late blight epidemics. In addition to the evaluation of the predictive quality of the model, this article provides a dataset that describes the development of various late blight epidemics on potato as a function of weather conditions, fungicide regimes, and cultivar susceptibility. Following this evaluation, the Shtienberg model can be used with confidence in research and development programs to better manage potato late blight in France.

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