Pathogenicity of pyricularia oryzae isolates obtained from cultivars grown in middle and high altitudes zones of Burundi
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
An International Journal of Basic and Applied Research
Abstract
Rice blast disease caused by the fungal pathogen called Pyricularia oryzae is an economically
important disease distributed in rice-growing regions of the world. Understanding pathogenic
variation among isolates paves a way towards the most effective ways to manage the disease.
Thirteen isolates of P. oryzae from high and middle altitude rice ecosystems were inoculated
into ten (10) cultivars most preferred by rice farmers in the middle and high-altitude areas of
Burundi. The isolates were then evaluated for their ability to cause rice blast disease under screen
house condition. A complete randomized design (CRD) with three replications was used. The
tested cultivars were evaluated as susceptible(S) or resistant (R) to a particular P. oryzae isolate
based on disease severity score determined through visual observation using a standard 0-9 scale
developed by IRRI. Highly significant differences (p=0.000) between location were observed in
rice blast disease incidence and severity. Significant differences (p=0.000) in blast incidence and
severity were recorded between cultivars as well as isolate. Disease incidence and severity in the
cultivars ranged from 11.11-33.33% and 3.70-69.14% respectively. Despite this variability in the
isolate pathogenicity, three rice cultivars (Mugwiza, Rufutamadeni and V18) were less susceptible
to the disease and hence can be regarded as having traits of resistance which can be used by rice
farmers for managing rice blast disease in the two rice ecosystems of Burundi but also as parent
materials for development of rice cultivars with resistance to rice blast.
Description
Journal Article
Keywords
Pathogenicity, Rice blast, Severity, Rice cultivars