The diversity of fungi associated with rice (Oryza sativa L.) RD41 variety from Pak
Phanang, Nakhon Si Thammarat province was investigated. Fungal samples were isolated from
soil, stem, and leaves at each growth stage of rice plants and grains. A total of 39 species were
identified, including 24 genera. Thirty-one species were found on soil and stem, 22 species
were found on leaves and 14 species were found on grains. Among these, 4 species, Bipolaris
oryzae, Curvularia lunata, Fusarium solani and Nigrospora oryzae were the dominant species
found in all substrates. The diversity of fungi that were found at each growth stage of rice
showed that in the maximum tiller stages had the highest fungi diversity which was following
flowering, panicle formation, maturity and the transplanting stage which were 36, 35, 33, 32
and 30 species, respectively. Only one species, C. lunata was a dominant among fungi found of
all growth stages of rice.