The use of biological agents in controlling diseases of shallots for tss production

Abstract Stemphylium disease caused by vesicarium is an important that becomes obstacle in TSS production. The attacks can lead to seed harvest failure. In the field. associated with purple spot fungus Alternaria porri . purpose of this study was obtain biological agents were effective controlling S and A on tests carried out in-vitro laboratory planta field under a plastic shade. experimental design used randomized block 11 treatments ( Bacillus sp.1. sp. 3., Pseudomonas florescens (Pf)., Trichoderma sp.2., sp.3., sp.1 + sp.2 Pf., sp.3 Pf, Control). Each treatment repeated 3 times. results showed sp., fluorescent as antagonist have varying inhibitory abilities against pathogens Inhibition S. 60.51-63.75% 25.78-31.47%. Meanwhile for A. both bacterial fungal had inhibition between 45.09-79.15%. Antagonist alone combination fluorescens increase number leaves seedlings shallots. agent P. reduce intensity diseases.