抄録
Two rusts, Puccinia sorghi SCHWEIN. and P.polysora UNDERW., recently attacked corn in Japan. P.sorghi occurred in Shiribeshi and Iburi districts of Hokkaido, the most northern part of Japan, 1981. Again, it was found over the broader area of Hokkaido, 1982. The occurrence of this rust over two years in cold area of Japan is an uncommon case. P.polysora was observed on dried leaves of corn sent from Okinawa prefecture, 1982. This is the first record of P.polysora in Japan.
