"The entomopathogenic fungi play an important role in suppressing the natural population of insect
pests. A number of these microorganisms are developed and commercialized as mycoinsecticides for controlling
arthropod pests in agriculture and forestry. A wide range of factors and the interactions between them can affect
the persistence and survival of entomopathogenic microorganisms; understanding of these factors is
indispensable for the successful use of microbiological control agents, in conditions of economic and ecological
efficiency. The influence of some of these factors on fungal development and fate in soil and on plants has been
studied by a number of authors for several entomopathogenic hyphomycetes used in biological control programs.
The aim of this study was to summarize a few aspects about the abiotic and biotic factors that influence the
biological activity of entomopathogenic microorganisms. The following environmental factors are presented:
light, temperature and humidity, soil, microorganisms, wind and precipitation.
"
"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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