BIOLOGY, VARIETAL SCREENING AND MANAGEMENT OF OKRA JASSID, Amrasca biguttula biguttula (ISHIDA)
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Date
2014-04
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
AGRICULTURAL ENTOMOLOGY DEPT., N.M. COLLEGE OF AGRICULTURE, NAVSARI AGRICULTURAL UNIVERSITY, NAVSARI
Abstract
Investigations were carried out on biology, varietal
screening and management of okra jassid, A. biguttula biguttula
at College Farm and PG Research Laboratory, Department of
Agricultural Entomology, N.M.C.A., N.A.U., Navsari duri ng
winter
2012-13.
Biological
studies
were
conducted
on
predominant species A. biguttula biguttula, which laid 17.47 ±
0.52 eggs and had five nymphal instars with an adult stage in the
development. The total nymphal period was 9.00 ± 1.15 days.
The sex ratio of male to female was 1:1.33 under field
conditions while it was 1:1.27 for laboratory reared adults. The
longevity of male and female with food was 13.33 ± 1.54 and
16.07 ± 1.10 days, respectively and without food was 16.20 ±
1.52 and 19.33 ± 1.66 hours, respectively. The total lifecycle
was 29.40 ± 1.68 days.
Out of eleven tested varieties of okra, “VRO-6”
recorded minimum jassid incidence (6.40 jassids/leaf) and it was
at
par
with
other
okra
varieties
viz.,
“AOL-9-17”
(6.97
jassids/leaf), “JOL-9-9” (7.49 jassids/leaf), “JOL-8-10” (8.02
jassids/leaf), “JOL-7K-12” (8.48 jassids/leaf), “JOL-8-16” (9.02
jassids/leaf). The genotype “JOL-9-11” registered the highest
population of jassid (11.90 jassids/leaf). Variety “ VRO-6”
recorded maximum fruit yield (26 44.8 kg/ha) whereas, the
lowest fruit yield was found on varieties “JOL-9-11” (1832.5
kg/ha).
Pertaining to bio-efficacy of various insecticides
against jassid indicated that the highest mean per cent mortality
i.e. 58.08 per cent was recorded in the plo ts treated with
imidacloprid 17.8 % SL @ 0.005 per cent. While, NSKE 3 per
cent
recorded
minimum
per
cent
mortality
over
control
(36.58%). Amongst different insecticidal treatments, maximum
(3986.9 kg/ha) fruit yield was harvested from the plots treated
with imidacloprid 17.8 % SL @ 0.005 per cent. The minimum
yield was recorded under control treatment of 2040 kg/ha.
The
highest
incremental
cost
benefit
ratio
was
recorded in the treatment of imidacloprid (1:28.58) followed by
acetamiprid
(1:19.38),
clothia nidin
(1:18.87),
acephate
(1:16.58), triazophos (1:10.42), azadirachtin (1:3.74), NSKE
(1:1.45) and lufenuron (1:0.47). The treatment of lufenuron
exhibited the minimum ICBR (1:0.47) compared to other
treatment.
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