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Abstract - Issue Nov 2012, 33 (6) Back
nstantaneous and historical temperature effects on a-pinene
Studies on Oecophylla
smaragdina as a bio-control agent against pentatomid bug infesting on Pongamia
tree
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Author
Details
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B.B.
Hosetti
(Corresponding author)
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Deptament of Applied Zoology, Bioscience complex, Kuvempu
University, Jnana Sahyadri,
Shankaraghatta - 577 451, India
e-mail : basalling@yahoo.co.in
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B.S.
Rudresh
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Deptartment
of Applied Zoology, Bioscience complex, Kuvempu University, Jnana Sahyadri,
Shankaraghatta - 577 451, India
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Publication
Data
Paper received:
26 June 2011
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Revised received:
17 November 2011
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Accepted:
22
December 2011
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Abstract
Weaver
ants, (Oecophylla smaragdina) have been found to predate on pentatomid
bug (Cyclopelta siccifolia) infesting Pongamia pinnata tree in
mid-western Ghat region of Shimoga district, Karnataka. The present study was
undertaken to evaluate the potential of weaver ants, that are abundant on P.
pinnata trees, to control the pentatomid bugs. Consistent and systematic
field surveillance was carried out for a period of two months, March and July
2010. This showed that the number of pentatomid bugs colony found on branches
of tree was significantly lower in tree with abundant weaver ants
(11.21-16.84%) than in trees with fewer weaver ants (26.51-38.24%), or in
trees without ants (61.42-75.47%) similarly, the branches damaged by pentatomid
bug (9.42-11.43%) their in trees with abundant weaver ants which was
significantly lower than in trees with fewer weaver ants (16.13-23.24%) and
without ants (38.42-51.47%) in March and July. The pentatomid bug colony and
their damage was significantly low on trees with abundant weaver ants than
with fewer ants, or without the ants. Field observations regarding
infestation of pentatomid bugs revealed that weaver ants are effective
naturally occurring biological agents help in controlling damage caused by
pentatomid bugs on Pongamia trees.
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Key words
Biological
control, Oecophylla smaragdina, Pentatomid bug, Pongamia pinnata,
Cyclopelta siccifolia, Weaver ants
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