The effect of temperature on colonization of Cercosporidium personatum leafspot of peanuts by the hyperparasite Dicyma pulvinata |
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| Institution: | 1. Instituto de Investigaciones en Catálisis y Petroquímica, Facultad de Ingeniería Química, Universidad Nacional del Litoral – CONICET, Santa Fe, Argentina;2. Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santa Fe, Argentina;1. Facultad de Ciencias Aplicadas a la Industria, Universidad Nacional de Cuyo, Bernardo de Irigoyen 375, 5600 San Rafael, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;3. Instituto de Biología Agrícola de Mendoza, Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad Nacional de Cuyo, Almirante Brown 500, 5507 Chacras de Coria, Argentina;4. Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Argentina |
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| Abstract: | Colonization of lesions of Cercosporidium personatum on detached peanut leaflets by the hyperparasite Dicyma pulvinata followed a logistic growth curve. The initial colonization rate and the asymptotic level of colonization were estimated by plotting the calculated relative rate of colonization against the percentage colonization. These two parameters and a subjective estimate of the time-lag in colonization were used to compare colonization of lesions, in the dark, by the hyperparasite at constant and cycling temperature regimes. No colonization was observed at constant temperatures ⩾31.5°C. The time-lag in colonization increased and the asymptotic level declined markedly at constant temperatures >28°C. At cycling temperature regimes, the initial colonization rate and the asymptotic level of colonization were directly related to the difference between maximum and minimum temperatures, especially at maximum temperatures >28°C. |
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