viral disease response trait rice grassy stunt 1 and 2 virus resistance plant_trait_ontology Causal agent: rice grassy stunt virus 1 (RGSV1) and rice grassy stunt virus 2 (RGSV2). Symptoms: RGSV1 causes severe stunting, excessive tillering, pale green to yellow and narrow leaves with small rusty spots. RGSV2 causes severe stunting, excessive tillering, yellow to orange and narrow leaves with small rusty spots. TO:0000213 RGSVRS (related)