In the present study,
insecticidal Activity of essential oils (lemon grass
Cymbopogon citratus, thyme Thymus
vulgaris and geranium Pelargonium
graveolens) and silver nanoparticles
(AgNPs) synthesized by using  tested
essential oils were evaluated against female of P. solenopsis
Tinsley. At high concentration (40µl/l), the percentages of p. solenopsis
mortality recorded 100, 100 & 86.70%, for thyme, lemon grass and geranium EOs,
while it recorded 100, 90 and 83.3 % at (400ppm) of AgNPs-thyme,
AgNPs-lemon grass, and AgNPs-geranium after 72hrs of treatment. All essential
oils and AgNPs were proved to be very toxic to female of p. solenopsis.
However, thyme essential oil and AgNPs-thyme recorded the highest mortality
percentage with LC₅₀ = 8.094 μl/l & 86.645 ppm, respectively,
followed by lemon grass (bulk & AgNPs- lemon grass oil) and geranium oil (bulk &
with AgNPs- geranium oil).