Influence of some microorganisms on the survival of the rice sheath blight pathogen [study conducted at IRRI, Philippines].
1982
Rosales A.M. | Mew T.W.
Sheath blight caused by Thanatephorus cucumeris is one of the important rice diseases. The project was undertaken to study the ecology of the pathogen in the tropics. The Cambridge method was employed to determine the competitive saprophytic ability and survival of T. cucumeris. Results showed that submerged condition affected the competitive saprophytic ability of T. cucumeris as indicated by low percentage colonization and low infectivity on IR 50 seedlings. Percentage recovery of T. cucumeris and number of sclerotial bodies produced was higher in dryland soil than in wetland soil. Under wetland conditions, sclerotial bodies were colonized by bacteria which inhibited the mycelial growth and reduced disease incidence in the greenhouse. In dryland conditions, however, a Trichoderma sp. not only decomposed the infected rice straw but also parasitized the mycelium of the fungus. These results indicate that these saprophytic microorganisms associated with wetland and dryland rice cultures may provide an alternative means to potentially minimize this disease.
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