Suppression of rice blast by preinoculation with avirulent Pyricularia oryzae and the nonrice pathogen Bipolaris sorokiniana

Avirulent isolates of Pyricularia oryzae and isolates of Bipolaris sorokiniana, a nonrice pathogen, were used to suppress rice blast caused by P. oryzae. In greenhouse experiments, both fungi substantially reduced leaf blast when applied 24 h or more before the pathogen. B. sorokiniana, but not avir...

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Bibliographic Details
Published in:Phytopathology 1998-07, Vol.88 (7), p.735-739
Main Authors: Manandhar, H.K. (Nepal Agricultural Research Council, Lalitpur, Nepal.), Jorgensen, H.J.L, Mathur, S.B, Smedegaard-Petersen, V
Format: Article
Language:English
Subjects:
AGENT PATHOGENE
Biological and medical sciences
BIOLOGICAL CONTROL
COCHLIOBOLUS SATIVUS
Control
CONTROL BIOLOGICO
CONTROL DE ENFERMEDADES
CONTROLE DE MALADIES
DEVELOPMENTAL STAGES
DISEASE CONTROL
ENFERMEDADES FUNGOSAS
ETAPAS DE DESARROLLO
FONGICIDE
Fundamental and applied biological sciences. Psychology
FUNGAL DISEASES
Fungal plant pathogens
FUNGICIDAS
FUNGICIDES
INDUCED RESISTANCE
INFECTIVITY
LUTTE BIOLOGIQUE
MALADIE FONGIQUE
NEPAL
ORGANISMOS PATOGENOS
ORYZA SATIVA
PATHOGENICITY
PATHOGENS
PATOGENICIDAD
Phytopathology. Animal pests. Plant and forest protection
POUVOIR PATHOGENE
PYRICULARIA ORYZAE
RESISTANCE INDUITE
RESISTENCIA INDUCIDA
SINTOMAS
STADE DE DEVELOPPEMENT
SYMPTOME
SYMPTOMS
VIRULENCE
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Summary:Avirulent isolates of Pyricularia oryzae and isolates of Bipolaris sorokiniana, a nonrice pathogen, were used to suppress rice blast caused by P. oryzae. In greenhouse experiments, both fungi substantially reduced leaf blast when applied 24 h or more before the pathogen. B. sorokiniana, but not avirulent isolates of P. oryzae, systemically reduced disease in leaf 5 when applied to whole plants at the four-leaf stage. In field experiments, both fungi were able to reduce neck blast significantly. No increase in grain yield was obtained by using avirulent isolates of P. oryzae, whereas five sprays with B. sorokiniana from seedling to heading stages increased the grain yield in two of three experiments conducted at two locations in Nepal. The significant increase in yield was observed under high inoculum pressure of P. oryzae. Induced resistance is suggested to be involved in the suppression of disease
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO.1998.88.7.735