Abstract
The present paper deals with investigation on the causal fungi of ear blighting of rice plant in Gifu Prefecture.
1. Many species of fungi, such as Helminthosporium oryzae, Cercospora oryzae, Pyricularia oryzae, Cladosporium sp. and Alternaria sp. were detected from a number of samples of ear blighting collected from various parts of Gifu Prefecture. Among them, Helminthosporium oryzae was usually found to be most popular.
2. Helminthosporium oryzae was detected from the samples at every stage after heading, while Cercospora oryzae was detected only from the samples at the ripening stage.
3. The frequency of Helminthosporium oryzae or Cercospora oryzae on the diseased ear was variable with the position on the ear as well as with the variety of rice plant.
