Rodent damage to rice can be measured at several stages of crop growth. In West Java, monocultures of lowland irrigated rice,
cumulative damage to rice during the dry season was 54% at the primordial stage, 32% at the booting stage, but only 16% at the
ripening stage. If measured at the ripening stage, the measured value ought to be multiplied by approximately 6.5 to obtain
cumulative damage to the rice crop or by 4.2 for an estimate of yield loss