cosmopolitan and are isolated from plant debris, from soil and from parasitized insects.
Beauveria species are also isolated from foodstuff, and indoor air environment.
Beauveria bassiana is a well known etiologic agent of the devastating muscardine
disease of the silkworm.
The genus Beauveria
contains several species; however, the most common ones are Beauveria bassiana and
Pathogenicity and Health Effects
is rarely responsible
for infection in humans or animals. It may be associated with
from the mentioned infection, a case of
pneumonia in an immunocompromised patient due to
Beauveria has also been reported. Certain Beauveria species are important
pathogens of insects.
rate is moderately rapid with a colony diameter ranging from 1 to 3 centimeters;
Ø The colony texture is cottony to powdery to mealy; and
Ø Color is white becoming yellowish white or pale pinkish while pale on the reverse.
hyphae are hyaline, narrow and septate;
Conidiogenous cells on the hyphae are inflated at the base and are
typically flask – shaped and terminates in a thin zigzagging filament;
Conidia are produced from each bending point of the filament, this type of
conidium production is called sympodial geniculate growth;
Conidia are hyaline, one – celled and globose to ovoid in shape and
diameter ranges from 2 to 4 µm;
conidiogenous cells tend to form dense clusters which appear as small
powdery balls in the aerial hyphae when viewed under a dissecting
Examination of young cultures is optimal for detailed microscopic view
since the cluster formation makes it difficult to visualize the
arrangement and structure of conidia.
Only general laboratory
precautions are required, no special safety measures needed.
No available data.