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Kvick Nastaj, Nadja, 2023. Fungicide tolerance in Phytophthora infestans. Second cycle, A2E. Uppsala: SLU, Dept. of Forest Mycology and Plant Pathology



For the last 180 years, the pathogen P infestans, responsible for the late blight disease, has been a severe problem for farmers. Despite the large efforts and financial investments done in the management of the disease, 15-30% of the potato production is lost to this disease globally each year. The late blight requires a high level of control, where fungicides play a crucial part, to protect the quantity and the quality of the harvest. The use of fungicides is associated with unfavourable consequences, where the risk of a reduced sensitivity to fungicides in the pathogen is one of the more severe. In this study, the aim was to examine how the use of different dosages of the fungicide Infinito affects the genotypic and phenotypic makeup of a P. infestans field population. The population was genetically characterized by using a 12-plex Simple Sequence Repeats (SSRs) method. Sensitivity to the fungicide in vitro was estimated based on radial growth on Infinito-amended rye-pea agar. The result of the study revealed a population with an unexpectedly narrow genotypic diversity. In the in vitro fungicide tests, no distinction between isolates from treated and untreated plots were observed. Neither were there any signs of selection towards more tolerant genotypes and no significant differences between individual isolates was observed.

Main title:Fungicide tolerance in Phytophthora infestans
Authors:Kvick Nastaj, Nadja
Supervisor:Andersson, Björn
Examiner:Friberg, Hanna
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2023
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NY011 Agricutural programme - Soil/Plant, 300.0hp
Supervising department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
Keywords:Phytophthora infestans, Fungicide tolerance, Fungicide dose
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Agricultural research
Crop husbandry
Plant diseases
Deposited On:06 Feb 2023 08:35
Metadata Last Modified:07 Feb 2023 02:00

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