Symptoms of bacterial blight

Damping off in seedling, the middle and late major hazard seedling stem base or underground roots, oval or irregular dark brown disease spot at first, early disease seedling wilting during the day, night recovery, disease gradually sag, excessive shrinkage, some gradients are dark brown, when the disease spot expanding around the stem dry death finally, but no lodging, strain only light brown depression disease spot and not die, seedbed of the disease when humidity is big department is not very obvious hazel spider filamentous fungi.