Afield experiment was carried out at the Experimental Farm of Sakha Agricultural Station in 2014 rice season using two cultivars, Giza 178 (high tillering capacity) and Egyptian Jasmine (medium tillering capacity) to determine the economic threshold level for control measures of stem borer Chilo agmemnon Bles. in rice. Seven simulated levels of dead hearts; 0, 5, 10, 15, 20, 25 and 30% were adopted to find out their effects on rice yield and yield components. In Giza 178 cultivar, dry matter content was significantly reduced at 25% detillering. Panicle weight, 1000-grain weight and filled grains increased as the detillering level increased. This could be attributed to the compensation phenomenon, as the rice hills that suffered from high detillering produced heavier grains in the remaining tillers. This trend was also obtained with the Egyptian Jasmine. The rice yield was significantly reduced at 15% in the former cultivar and at 20% in the latter one. Economic analysis showed that the economic threshold is 25% damaged tillers in Giza 178 rice cultivar and 20% in the Egyptian Jasmine. This might be due to that Giza 178 is higher tillering cultivar than the Egyptian Jasmine. Thus, control measures, particularly insecticides, should not be applied before dead hearts reach 25% in case of Giza 178 cultivar and 20% in case of Egyptian Jasmine.