Plant and Soil

, Volume 69, Issue 2, pp 171–175 | Cite as

Inhibition ofHelminthosporium oryzae andAlternaria solani byStreptomyces longisporus (Krasil'nikov) Waksman

  • S. K. Chattopadhyay
  • B. Nandi


Streptomyces longisporus, isolated from field soil in association with wheat stubble, showed antagonism againstHelminthosporium oryzae andAlternaria solani in vitro as well as in soil (autoclaved). The organism or its filtrate showed formation of a distinct zone of inhibition in culture against the pathogens. Infected potato seed pieces or rice grains dipped in the culture filtrate prevented or reduced disease incidence to different degrees depending on the period of treatment. Infestation of soil (autoclaved) withS. longisporus and the pathogens in various combinations also reduced disease incidence. Among such combinations, infestation withS. longisporus followed by the pathogens proved to be the most efficient.

Key words

Alternaria solani Antagonism Biological control Brown spot Disease control Early blight Helminthosporium oryzae Streptomyces longisporus 


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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1982

Authors and Affiliations

  • S. K. Chattopadhyay
    • 1
  • B. Nandi
    • 1
  1. 1.Department of BotanyBurdwan UniversityBurdwanIndia

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