We isolated a bacterial strain NSD29, which is a species of Herpetosiphon. We assigned it as H.llansteffanensis sp. based on morphological, physiological and molecular characteristics. It has strong potential for plant disease biocontrol agent

NSD29 has a strong predation ability against plant pathogenic bacteria, among which its predation ability against pear fire blight fungus is the strongest. Subsequently, bioexperiments were conducted using fragrant pear inflorescences, leaves, pear fruits and branches as inoculation materials, and it was found that it has significant biocontrol potential against pear fire blight fungus