An eco-friendly agent, hydrogen peroxide (H2O2)-based compound, peroxyacetic acid (PAA) gave efficiency against Sclerotinia sclerotiorum growth and infectivity. Significant inhibitory effect for PAA against linear growth (LG), sclerotial formation (SF) and mycelial dry weight (MDW) by 0.4 g/l acetic acid +0.8 g/l H2O2 was recorded. Inhibitory effects were increased by enhancing H2O2 concentration (0.4 g/l AA +1.2 g/l H2O2) that caused 85, 91 and 83% inhibition for LG, SF and MDW, respectively. In addition, carpogenic germination measures of S. sclerotiorum sclerotia were significantly reduced upon PAA treatments. Carpogenic germination was reduced from 100% to 62% and 50% by 38% and 50% inhibition when S. sclerotiorum sclerotia were treated by 0.4 g/l AA + 0.8 g/l H2O2 and 0.4 g/l AA+ 1.2 g/l H2O2, respectively. Reduction of carpogenic germination by H2O2 based compound was accompanied with significant lowering in number of stipes and apothecia/ sclerotium. Drenching sclerotinia-infested soil with PAA, seven days pre-planting provided significant reduction in root and crown rot diseases of bean plants. When soil was singly drenched by 0.4 g/l acetic acid +0.8 g/l H2O2 or 0.4 g/l acetic acid+1.2 g/l H2O2 protected bean plants against root and crown rot by 47 and 67%, respectively. A substantial protection was pronounced against white rot of bean pods. Posttreatment by PAA was more effective to reduce white rot than pre-one.