rice hoja blanca disease resistance plant_trait_ontology RHBV (related) TO:0000147 HBVRS (related) Causal agent: rice hoja blanca virus (RHBV). Symptoms: cream colored to yellow spots, elongating and coalescing to form longitudinal yellowish green to pale green striations. Streaks may coalesce to cover the whole leaf. Brown and sterile glumes with typical "parrot beak" shape of deformation. viral disease response trait