INFLUENCE OF CERTAIN ENVIRONMENTAL FACTORS IN THE FIELD ON INFECTION OF RICE BY PIRICULARIA ORYZAE
ARMY BIOLOGICAL LABS FREDERICK MD
Pagination or Media Count:
The amount of dew, the length of the dew period, and the leaf area at the time of inoculation were the only significant variables correlated with the average number of lesions per plant when rice Oryza sativa in the susceptible stage was inoculated daily during an 11-week period with conidia of Piricularia oryzae. Daily records were kept on dew, rain, temperature and relative humidity of the air, light, soil temperature, and leaf area of the rice plants. No apparent effect of air temperature in the range of 61-95 F on infection by the blast organism was found.