The thermal tolerance of four isolates of Beauveria bassiana and one isolate of Beauveria pseudobassiana was evaluated in vitro, by measuring the colonial diameters, on PDA medium, at temperatures between 5 and 35 ° C, during 14 days. The data obtained were used to calculate the growth rate of fungal colonies (mm / day), using linear regression. The representation of the values corresponding to the minimum, optimal and maximum temperature for vegetative growth was a curve described by a modified beta (ß) mathematical function. The minimum growth temperature of these isolates varied between 3.4 and 4.5 °C, the optimum temperature varied between 21.8 and 22.9 °C, except for one isolate of which optimal temperature was 26.8 °C, while the maximum temperature was varied for all isolates between 35.0 and 35.7 °C.
"The effect of temperature on the mycelial growth of two isolates of Metarhizium anisopliae (Metch.)
Sorok. (Hypocreales, Clavicipitaceae) was evaluated in vitro on PDA growth medium, by measuring the
diameter of the fungal colonies, at the following temperature values: 5, 10, 15, 20, 25, 30, 35 and 40 °C, over 14
days under constant conditions. The data obtained were used for the calculation of the growth rate (mm/day)
using linear regression. The representation of the values corresponding to the minimum, optimal and maximum
temperature of vegetative growth was made by a curve described by a mathematical function, a modified beta (ß)
function. The lowest temperatures at which growth occurs are 7 and 10°C, the highest is 35.7°C; temperature at
which the most growth occurs, as indicated by the measurements, was distributed over a range of temperatures
from 22.9 to 31°C."
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