ABSTRACT An experiment on the relation of disease intensity of BLB (Bacterial Leaf Blight) against the decreasing of rice achievement (Oryza sativa L.) had been carried out fron January 17th until April 30th 1992 at the Laboratory of Observation and Forecasting to the Dieesse of Rice in Kedu, Temanggung, Central Java, at altitude of 613 meters, on Latosol soil with an acidity (pH) of…