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2013 ; 4
(4
): 631-45
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Entomopathogenic Fungi Associated with Exotic Invasive Insect Pests in
Northeastern Forests of the USA
#MMPMID26462527
Gouli V
; Gouli S
; Marcelino JA
; Skinner M
; Parker BL
Insects
2013[Nov]; 4
(4
): 631-45
PMID26462527
show ga
Mycopathogens of economically important exotic invasive insects in forests of
northeastern USA have been the subject of research at the Entomology Research
Laboratory, University of Vermont, for the last 20 years. Elongate hemlock scale,
European fruit lecanium, hemlock woolly adelgid and pear thrips were analyzed for
the presence of mycopathogens, in order to consider the potential for managing
these pests with biological control. Fungal cultures isolated from insects with
signs of fungal infection were identified based on morphological characters and
DNA profiling. Mycopathogens recovered from infected insects were subdivided into
three groups, i.e., specialized entomopathogenic; facultative entomopathogens;
ubiquitous opportunistic contaminants. Epizootics were caused by fungi in the
specialized group with the exception of M. microspora, P. marquandii and I.
farinosa. Inoculation of insects in laboratory and field conditions with B.
bassiana, L. muscarium and Myriangium sp. caused insect mortality of 45 to 95%.
Although pest populations in the field seemed severely compromised after
treatment, the remnant populations re-established themselves after the winter.
Although capable of inducing high mortality, a single localized aerial
application of a soil-dwelling fungus does not maintain long-time suppression of
pests. However, it can halt their range expansion and maintain populations below
the economic threshold level without the use of expensive insecticides which have
a negative impact on the environment.