Sciences of Phytochemistry,
Год журнала:
2024,
Номер
3(2), С. 98 - 104
Опубликована: Ноя. 9, 2024
Spodoptera
frugiperda
is
an
invasive
pest
causing
significant
crop
losses
worldwide.
Resistance
development
and
health
environmental
concerns
associated
with
synthetic
insecticides
have
prompted
a
search
for
eco-friendly
biopesticides.
Limonoids
such
as
salannin,
volkensin,
volkensinone,
isolated
from
the
East
African
plant
Melia
volkensii,
show
antifeedant
activity
against
S.
larvae.
Volkensin
had
ED50
of
3.5
µg/cm²,
volkensinone
(a
lactone
volkensin)
6
salannin
13
µg/cm².
Additional
limonoids
M.
including
salanninolide
toosendanin,
also
displayed
strong
effects.
With
toosendanin
already
used
commercially,
re-evaluation
volkensii
compounds
was
conducted
using
in
silico
techniques.
Docking
simulations
3D
models
these
ryanodine
receptor
protein
revealed
binding
affinities
-6.4
to
-7.5
kcal/mol,
comparable
those
chlorantraniliprole,
commercial
insecticide
targeting
receptors.
These
at
two
distinct
sites
align
well
in-vitro
activity,
underscoring
volkensii’s
potential
environmentally
friendly,
receptor-targeted
biopesticide
frugiperda.
Egyptian Journal of Biological Pest Control,
Год журнала:
2023,
Номер
33(1)
Опубликована: Авг. 16, 2023
Abstract
Background
Bacillus
thuringiensis
(
Bt
)
is
known
as
the
most
successful
microbial
insecticide
worldwide
used
against
lepidopteran
insect
pests
in
agriculture.
Native
isolate
VKK5
showing
insecticidal
activity
Spodoptera
frugiperda
(FAW)
(J.E.
Smith)
(Lepidoptera:
Noctuidae)
was
characterized
B.
(BtVKK5)
on
a
morphological
and
molecular
basis.
Recent
research
has
shown
that
can
be
established
an
endophytic
organism
for
controlling
pests.
The
present
work
aimed
at
assessing
colonization
of
BtVKK5
endophyte
five
maize
cultivars
by
seed
treatment
(ST),
soil
drenching
(SD),
foliar
application
(FA)
combination
all
methods
(ST
+
SD
FA)
its
bioefficacy
neonates
FAW.
Results
Establishment
inoculated
endophytes
cultivars,
viz.
Pusa
HQPM7
Improved,
Jawahar
Hybrid
Maize
1,
Vivek
27
Improved
(PVH27I),
HQPM5
DMRH
1301,
confirmed
re-isolating
from
leaves
plant
ampicillin-selected
agar
plates.
Estimation
colony-forming
units
per
gram
leaf
showed
there
significant
difference
strain
among
different
inoculation
methods.
colonies
were
further
substantiated
amplification
cry1A
cry1E
genes.
Bioefficacy
studies
highest
mortality
(50%)
ST
FA
method,
followed
(40%)
PVH27I.
Moreover,
growth
inhibition
observed
survived
larvae
plants
vis-a-vis
control.
Conclusion
plants,
complemented
with
activity,
could
possibly
lead
to
innovative
approach
management
S.
other
borers.
Research Square (Research Square),
Год журнала:
2024,
Номер
unknown
Опубликована: Март 15, 2024
Abstract
The
fall
armyworm
Spodoptera
frugiperda
(J.E.
Smith)
is
a
new
serious
destructive
and
widespread
pest
of
corn
which
recently
invaded
subtropical
regions
worldwide.
As
this
invasive
species
spreading
across
the
continent,
it
vital
to
assess
its
susceptibility
currently
used
insecticides
establish
potential
underlying
resistance
mechanism
better
inform
control
programmes.
In
study,
we
characterized
strains
from
eighteen
populations
different
countries
in
West
Africa,
established
their
profiles
main
genotyped
target
site
alleles.
RFLP-PCR
method
showed
that
majority
population
tested
was
strain
(72.5
–
100%)
compared
probable
rice
(0
27.5%).
Tpi
sequencing
suspected
revealed
almost
all
samples
analysed
were
(>97%).
Additionally,
among
three
tested,
λ-cyhalothrin
chlorpyrifos
induced
lowest
toxicity
against
pest,
while
emamectin
benzoate
exhibited
moderate
toxicity.
Synergism
tests
performed
investigate
biochemical
by
breakdown
indicated
metabolic
enzymes
(oxydases,
esterase
glutathion-S-transferase)
play
major
roles
observed
western
Africa.
Target
mutation
(qPCR)
combined
with
previous
synergetic
organophosphates
pyrethroids
could
be
due
+
amino
acid
mutations
(presence
F290V
mutation)
or
(absence
T929I
mutation),
respectively.
results
study
provide
valuable
information
for
supporting
decisions
related
sustainable
applied
management.
Journal of Agricultural and Food Chemistry,
Год журнала:
2024,
Номер
72(36), С. 19948 - 19956
Опубликована: Авг. 26, 2024
The
key
mutations,
such
as
the
Gly-4891-Glu
substitution
and
Ile-4734
multiple
substitutions
within
ryanodine
receptors
(RyR),
are
linked
to
diamide
resistance
in
fall
armyworm
(FAW),
Sciences of Phytochemistry,
Год журнала:
2024,
Номер
3(2), С. 98 - 104
Опубликована: Ноя. 9, 2024
Spodoptera
frugiperda
is
an
invasive
pest
causing
significant
crop
losses
worldwide.
Resistance
development
and
health
environmental
concerns
associated
with
synthetic
insecticides
have
prompted
a
search
for
eco-friendly
biopesticides.
Limonoids
such
as
salannin,
volkensin,
volkensinone,
isolated
from
the
East
African
plant
Melia
volkensii,
show
antifeedant
activity
against
S.
larvae.
Volkensin
had
ED50
of
3.5
µg/cm²,
volkensinone
(a
lactone
volkensin)
6
salannin
13
µg/cm².
Additional
limonoids
M.
including
salanninolide
toosendanin,
also
displayed
strong
effects.
With
toosendanin
already
used
commercially,
re-evaluation
volkensii
compounds
was
conducted
using
in
silico
techniques.
Docking
simulations
3D
models
these
ryanodine
receptor
protein
revealed
binding
affinities
-6.4
to
-7.5
kcal/mol,
comparable
those
chlorantraniliprole,
commercial
insecticide
targeting
receptors.
These
at
two
distinct
sites
align
well
in-vitro
activity,
underscoring
volkensii’s
potential
environmentally
friendly,
receptor-targeted
biopesticide
frugiperda.
