Epidemiological studies on the Sclerotia production of the rice sheath blight.
1995
Elazegui F.A. | Castilla N.P. | Savory S.
Sclerotia of Rhizoctonia solani were collected from infected plants in lowland, irrigated ricefields of Batangas, Bulacan, Laguna, Nueva Ecija, Quezon, and Rizal [Philippines] in Oct 1994. Sclerotia collected from a ricefield in each province was considered as an isolate. Sclerotia production by the different isolates as affected by inoculum amount and leaf wetness duration was then studied in screenhouse. Sclerotia from an isolate collected in IRRI [International Rice Research Inst., Los Banos, Laguna, Philippines] which has been used as inoculum for experiments was included. Bulacan isolate significantly produced the most number of sclerotia followed by Batangas and Nueva Ecija isolates, with average counts of 52, 27, and 18, respectively. The IRRI isolate produced the lowest number of sclerotia, with an average count of 3. Sclerotia production was not affected by inoculum amount (5 vs. 15 g) nor by leaf wetness duration (wet every night, wet every other night or completely dry). For all isolates, the number of sclerotia formed decreased over time. Information on this phase of the sheath blight cycle will be synthesized with data on other phases and with other epidemiological data in a simulation model, thereby providing means to help delineate management strategies for sheath blight.
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