Repellency
Assays with Plant Extracts and Essential Oils from Schinus molle var.
areira (L) (Anacardiaceae) and DEET against Nezara viridula L.
(Hemiptera: Pentatomidae)
Jorge
Werdin González, Maria Mercedes Gutiérrez,
Adriana Alicia Ferrero
Abstract
Nezara viridula L. is
one of the key pests in soybean crops. The aim of this work was
to study the repellent effects of
ethanolic and hexanic extracts, essential oils from leaves and fruits
of Schinus molle var. areira and N, N-diethyl-m-toluamide
(DEET) against adults of N. viridula
in a choice-test arena. Half of a circular white filter paper of 9 cm.
diameter was treated
with extracts, essential oils or DEET and the other half with solvent
alone.
Each extract was tested at 1.572
µg/cm2,
3.144 µg/cm2 and 6.288 µg/cm2,
each essential oil and
DEET were tested at 78.6 µg/cm2, 157.2
µg/cm2 and 314.4
µg/cm2.
Repellency asssays were
carried out at 1 and 24 h. Ethanolic extracts from leaves and fruits
were
neutral at 1 and 24 h. Fruits and leaves hexanic extracts showed
repellent
activity at 1 h; however, hexanic extracts from leaves at the lowest
dose lost
the effect at 24 h. Essential oils from leaves (157.2 µg/cm2
and 314.4
µg/cm2)
showed repellent effect at
1 h and the
essential
oils from fruits at these same doses maintained the activity for 24 h.
DEET was
repellent at all doses evaluated.
Key
words
- Southern green stink bug, Brazilian peppertree,
plant extracts, N, N-diethyl-m-toluamide,
repellent effect.
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