Relationships between temperature and latent periods of rust and leaf-spot diseases of groundnut uri icon

abstract

  • The effect of temperature on the latent periods of rust, late leaf spot and early leaf spot diseases ofgroundnut caused by Puccinia arachidis, Phaeoisariopsis personata and Cercospora arachidicola.respectively, was studied. The latent periods (LP) of rust, late leaf spot and early leaf spot ranged from12-49 days, 13-38 days and 13-39 days, respectively, between 12 C and 33 C An equation relating therate of pathogen development (1/LP) to temperature was fitted using daily mean temperatures to providethree cardinal temperatures: the minimum (7"m,n), optimum (r^pc), and maximum (Tm,,). T^,^ was aboutI2°C for rust and about 10°C for the two leaf-spot diseases. Top, for all three diseases was close to 25 C.7"max was Bl'C for early leaf spot, and extrapolated values for late leaf spot and rust were about 35 and40°C, respectively

publication date

  • 1994
  • 1994