Abstract

• The study on the isolation and morphological characterization of pathogenic fungi infected plants of Oryza sativa L. (Paw San Baykyar rice variety) was carried out at the Microbiology Laboratory, Department of Botany in Monywa University, Myanmar from June to November, 2018. The disease-infected plant samples were collected from the rice fields in Monywa District. The different cultural media of Low Carbon Agar (LCA), Potato Dextrose Agar (PDA) and Water Glucose Agar (WGA) were used for the isolation of pathogenic fungal strains. The morphological characterization was studied on their colony morphology, macroscopical and microscopical characters. Total of 12 genera (Alternaria sp., Aspergillus sp., Cercospora sp., Fusarium spp., Nigrospora sp., Sarocladium sp., Curvularia sp., Ustilaginoidea sp., Penicillium sp., Rhizopus sp., Cladosporium sp., Bipolaris sp.) and 13 pathogenic fungal strains (HH 01 - HH 13) were isolated and identified from leaves, leaf sheaths, grains and seeds of the disease-infected rice plants. The HH 01 strain as Alternaria sp., HH 02 strain as Aspergillus sp., HH 03 strain as Cercospora sp., HH 04 strain as Fusarium sp., HH 05 strain as Nigrospora sp., HH 06 strain as Sarocladium sp., HH 07 strain as Curvularia sp., HH 08 strain as Fusarium sp., HH 09 strain as Ustilaginoidea sp., HH 10 strain as Penicillium sp., HH 11 strain as Rhizopus sp., HH 12 strain as Cladosporium sp. and HH 13 strain as Bipolaris sp. were identified.