The type and severity of panicle blast symptoms caused by the fungal pathogen Magnaporthe grisea (Pyricularia oryzae). Symptoms: Dark, necrotic lesions cover partially or completely around the panicle base (node) or the uppermost internode or the lower part pf panicle axis. The panicles are greyish and have either partially filled or unfilled grains Panicle blast Damage PBDam Panicle blast damage acronym entity variable_of scale_of method_of attribute