Figure 1

Hypovirulence and its associated traits of Sclerotinia sclerotiorum strain XG36-1. A, abnormal colony morphology developed on 20 ml PDA plate at 20–22 C for 15 days, a typical colony morphology of S. sclerotiorum (strain XG-13) developed at the same condition was showed as control. B and E, strain XG36-1 did not induce any typical lesion on detached leaf of rapeseed (Brassica napus) as strain XG-13 did; lesions were photographed and measured at 60 hpi. C and D, comparing to strain XG-13, strain XG36-1 grew on PDA plate slowly and produced less biomass (grown out on cellophane membranes on top of 20 ml PDA plate at 20°C for 72 h).