Influence of meteorological factors on occurrence and severity of black scurf on potato tubers
Barbara Lutomirska
b.lutomirska@ihar.edu.plInstytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy, Zakład Agronomi Ziemniaka w Jadwisinie (Poland)
Joanna Jankowska
Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy, Zakład Agronomi Ziemniaka w Jadwisinie (Poland)
Abstract
The black scurf is one of the symptoms which can be caused by Rhizoctonia solani. Actually 14 anastomosis groups (AGs) of this fungus are known to exist. The AG3 is considered to be the most pathogenic with the biggest ability to cause black scurf. The AG3 was identified as the dominant one in our country. The results of the studies on the severity of black scurf occurrence indicate that it is determined by the weather conditions. Opinions, in which period the meteorological factors have the strongest effect on the development of sclerotia on the tubers, are ambiguous. The influence of rainfall, air temperature and the hydrothermal condition (Sielianinov coefficient) in full growth of plants and during the 30 days prior to harvest on the share of tubers with black scurf and degree of infestation were evaluated. The results of the evaluations of the incidence of black scurf in the cultivar trials carried out in Plant Breeding and Acclimatization Institute-NRI, Agronomy Department in Jadwisin, in the years 2007-2013 and meteorological data from the local meteorological point have been used. Studies have shown that the strongest factor determining the share of infected tubers and the degree of tuber infestation in all maturity groups of cultivars is the Selianinov coefficient in full plant development. A significant influence of the levels of other factors in this growth phase on the occurrence of sclerotia of R. solani was also found. Along with the growth of Sielianinov coefficient and total rainfall, the share of tubers with sclerotia and the symptom severity increased. The rise of temperature is limited the black scurf occurrence. Analysis of the role of the above factors the in period of maturation showed a significant effect of thermal conditions only.
Keywords:
potato, mteorogical factors, black scrufReferences
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Authors
Barbara Lutomirskab.lutomirska@ihar.edu.pl
Instytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy, Zakład Agronomi Ziemniaka w Jadwisinie Poland
Authors
Joanna JankowskaInstytut Hodowli i Aklimatyzacji Roślin — Państwowy Instytut Badawczy, Zakład Agronomi Ziemniaka w Jadwisinie Poland
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