What question did this study set out to answer?

To evaluate the degree of resistance against brown spot disease (Bipolaris oryzae) and its impact on yield among traditional Nepalese rice landraces.

October 18, 2024Agronomy Journal of NepalOpen Access

Response of Nepalese Rice Landraces to Brown Spot Bipolaris oryzae (Breda de Haan) Shoemaker at Rampur, Chitwan, Nepal

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Field evaluation reveals widespread brown spot susceptibility in Nepalese rice landraces, highlighting the need for targeted resistance breeding.

To evaluate the degree of resistance against brown spot disease (Bipolaris oryzae) and its impact on yield among traditional Nepalese rice landraces.
Evaluated 54 rice genotypes (52 landraces, one resistant check, and one susceptible check) in an alpha lattice design with three replications from June to November 2018 in Rampur, Chitwan, Nepal.
Measured disease severity using the area under the disease progress curve (AUDPC), harvested seed-borne pathogen incidence, and grain yield parameters.
Categorized nine genotypes as moderately resistant, 38 as susceptible, and seven as highly susceptible based on AUDPC scores.
Identified maximum seed infection in Hodbachhi (64.9%) and Sankharika (64.15%), while the control Sabitri exhibited the lowest incidence (4.05%).
Recorded highest grain yield in Ghusara (1.55 t ha⁻¹) and lowest in Ghuyeni Saro (0.21 t ha⁻¹), with all yield attributes negatively correlated with AUDPC.

Lamsal et al. (2024) studied this question.

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Field evaluation reveals widespread brown spot susceptibility in Nepalese rice landraces, highlighting the need for targeted resistance breeding.