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Evaluation of the incidence of fungal and bacterial diseases in potatoes under field conditions

Hanna Gawińska-Urbanowicz

h.urbanowicz@ihar.edu.pl
Instytut Hodowli i Aklimatyzacji Roślin w Radzikowie, Zakład Nasiennictwa i Ochrony Ziemniaka w Boninie (Poland)


Abstract

The occurrence of fungal and bacterial diseases was assessed in field investigations that involved 23 potato cultivars. The studies were carried out in the years 2003–2005 at the Department of Potato Protection and Seed Science in Bonin. Infection of potato plants with black leg was evaluated twice: after emergence and at the stage of full growth. A proportion of infected plants in each plot was estimated. To assess tuber infection with soft rot, dry rot, common scab, silver scurf and black scurf tuber samples 10 kg each were taken in four replications from each plot during harvesting. Two samples were evaluated in the autumn, and two samples were stored to be evaluated in the spring next year. To assess tuber infestation by soft rot and dry rot, percentage by weight was determined. A rate of tubers infection with common scab, silver scurf and black scurf was estimated in a 5-grade scale. Moreover, a percentage index of infection was calculated for each cultivar. Significant differences between the cultivars in the rates of infection of progeny tubers with particular pathogens except black leg were found. A level of resistance of the cultivars to black leg could not be determined because of the low intensity of the disease throughout the experiment. Disease symptoms were only found on the tubers of cultivars Augusta and Rosalind (both early) and Romula (mid early).


Keywords:

black leg, black scurf, common scab, cultivar, dry rot, potato, silver scurf, soft rot

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Published
2007-03-30

Cited by

Gawińska-Urbanowicz, H. (2007) “Evaluation of the incidence of fungal and bacterial diseases in potatoes under field conditions”, Bulletin of Plant Breeding and Acclimatization Institute, (243), pp. 191–197. doi: 10.37317/biul-2007-0083.

Authors

Hanna Gawińska-Urbanowicz 
h.urbanowicz@ihar.edu.pl
Instytut Hodowli i Aklimatyzacji Roślin w Radzikowie, Zakład Nasiennictwa i Ochrony Ziemniaka w Boninie Poland

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