Biological control agents against major pathogens of rice in the Yangtze Delta area of China.
2001
Xie Guanlin | Yu Xuefang and Ren Xiaoping
Biocontrol agents (BCA) of bacteria from rice of three cultural patterns (direct row seeding, direct broadcast seeding, and transplanting) were evaluated, detected, and identified in the Yangtze Delta area of China during 1997-2000. Some 8,993 nonpathogenic bacterial isolates were isolated from 1,050 samples of leaf sheath and grain of rice collected at six different growth stages and tested for antagonistic effects against major pathogens of rice. The number against Rhizoctonia solani was the highest. Seed yielded the lowest number among the three parts of the rice plant. The population of BAC decreased with rice plant maturity in the three cultural patterns. A higher fluctuation of the BCA population was noted in some stages in each cultural pattern. The higher number of BCA detected was closely related to the severity of rice sheath blight in the field. Some promising BCA were found in field evaluations against sheath blight and bakanae disease of rice. Seven genera of 17 species or types were involv d in antagonistic activity against the six major pathogens of rice.
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Эту запись предоставил International Rice Research Institute