Resumo

CARDONA, Reinaldo. Sarocladium oryzae: causative agent of the rotting of the rice sheath in Venezuela. Rev. Soc. Ven. Microbiol. [online]. 2013, vol.33, n.1, pp.80-82. ISSN 1315-2556.

In the rice producing areas of Venezuela, a disease characterized by oblong and irregular spots of a grayish-brownish color on the sheath which covers the particle has been observed. The purpose of this work was to determine the causative agent of the rotting of the rice sheath in Venezuela. After taking samples of the rice plants of the Venezuela 21 variety with the above characteristics, sections of the interphase healthy-diseased tissue were inoculated into Petri dishes with potato-dextrose agar, and Petri dishes with sterile filter paper dampened with distilled water, and they were incubated in the laboratory until there was growth of fungal structures. The identification of the fungus was done by comparing its micro and macroscopic characteristics with those described in specialized literature. By this method it was possible to identify the isolates as Sarocladium oryzae, and it was concluded that this species is the causative agent of the rotting disease of the sheath of rice in Venezuela.

Palavras-chave : Oryza sativa; Sarocladium oryzae; pathogenicity; rotting of the rice sheath.