Preliminary study on biological activity of shenqinmycin against Sclerotinia sclerotiorum

Shenqinmycin is a novel antibiotic with the effective component phenazine-1-carboxylic acid originated from microorganisms.The sensitivity of Sclerotinia sclerotiorum isolates to shenqinmycin was tested.The results showed that the EC50 value of shenqinmycin against mycelium growth of 51 tested Sclerotinia sclerotiorum isolates was 3.31±0.77 μ g/mL in average.There was no cross-resistance between shenqinmycin and commonly used fungicides,such as carbendazim(MBC) and dimethachlon in Sclerotinia sclerotiorum.The control efficacy of 200 μ g(a.i)/mL shenqinmycin against sclerotinia leaf spot on the detached leaves of oilseed rape was 67.08%.The results of field trial showed that the control efficacy of 200 μ g(a.i)/mL shenqinmycin against sclerotinia stem rot of oilseed rape was 83.29％,which was better than that of iprodione.