Rice Blast Epiphytology

摘要

Data on rice blast disease from the field and laboratory experiments of many workers are reviewed and related to epiphytotics of the disease. Principal topics discussed are (1) sources of inoculum, (2) spore dispersal, (3) meteorological and other conditions required for establishment of infection and disease buildup, (4) spread, (5) yield reduction, (6) control measures, and (7) the present ability to predict disease outbreak, buildup, and yield losses. A theoretical curve describing minimum requirements of dew period and temperature for infection was developed from laboratory data, and appears to fit two sets of field data. This curve was used to find the percentage of days favorable for disease development during 24 epiphytotics, and regression equations were derived relating this parameter, along with other parameters derived from disease increase data, to yield loss caused by epiphytotics. (Author)