Abstract
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.
Highlights
Beauveria bassiana is a cosmopolitan entomopathogenic fungus which causes white muscadine disease in a range of arthropods, including agricultural pests
No development of vegetative mycelium was recorded at the temperature of 5 oC and 35 oC but in all isolates they developed at a temperature of 5 oC outside the observation period
The growth rate of the fungus indicated by the linear regression curve was the main parameter for evaluating the influence of temperature on vegetative growth
Summary
Beauveria bassiana is a cosmopolitan entomopathogenic fungus which causes white muscadine disease in a range of arthropods, including agricultural pests. Fluctuations in sensitivity to environmental factors depends on the isolate or specific strain, the importance of temperature and relative humidity is known to influence the pathogenicity of entomopathogenic fungi (Bugeme et al, 2008). In this context, the identification of abiotic factors, which confer optimal biological characteristics of different strains, becomes extremely important, insofar as they denote virulence on the target insects. The need to identify the thermal profile has a major importance in the selection of entomopathogenic fungi as future candidates in the development of a micro-insecticide This experiment can be useful in predicting mycosis of soil insects, in field conditions
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