Nematicidal and Reproduction Supression Activity of Actinomyces Isolates against Pine Wood Nematode, Bursaphelenchus xylophilus

Thirty-two actinomycetes isolates from Korean forest soil were screened for their nematicidal and reproduction suppression activity against pine wood nematode (PWN) which is widely spread in Korea.Culture filterates of 21 isolates showed more than 90% mortality at 2-fold concentration.Among them, AM210, SG16, YD116 and YD315 were more effective than others on reproduction of PWN.The YD116 isolate was identified as Streptomyces atratus by morphological and 16S rDNA analyses.Hydrazine hydrate, similar to hydrazidomycin which has cytotoxicity among substances from S. atratus against PWN, was tested for its nematicidal activity.Ten ppm of the hydrate showed 60.8% mortality.Additional studies are needed for practical use of the S. atratus YD116 isolate.