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Age Specific Survival and
Fecundity Table of Coccinella
septempunctata L. on Different Aphid
Species
Ali Arshad, Rizvi Parvez
Q.*
Department of Plant
Protection, Faculty of Agril. Sciences, A.M.U.,
Aligarh-202 002, India.
*E-mail:
<mailto:pqrizvi@rediffmail.com?cc=gbehal@indianjournals.com>
Abstract
Observations for two successive
generations were made to find out survival and
fecundity of Coccinella septempunctata with
respect to different aphid species viz.,
Lipaphis erysimi, Aphis craccivora,
Hyadaphis coriandri, Rhopalosiphum
nymphae and Macrosiphum rosae under
laboratory conditions at 25±1°C, 65±5% RH coupled
with photoperiod maintained at 12:12 hrs (L:D).
The highest potential fecundity and net
reproductive rate of Coccinella
septempunctata was obtained on L.
erysimi (129.43 eggs/female & 40.14
females/female/generation, respectively), and the
lowest on M. rosae (39.62 eggs/female &
7.13 females/female/generation, respectively).
Various growth parameters viz., finite rate
of increase, intrinsic rate increase and annual
rate of increase were however, found maximum on
A. craccivora (1.096, 0.091
females/female/day & 3.72x14/annum,
respectively), followed by L. erysimi
(1.090, 0.087 females/female/day &
6.21x13/annum, respectively) and
minimum on M. rosae (1.04, 0.042
females/female/day & 5.26x6/annum,
respectively). The mean length of generation and
doubling time were however, recorded minimum on
A. craccivora (38.22 & 7.54 days,
respectively) and maximum on M. rosae
(46.45 & 16.34 days, respectively).
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Key words
Aphis
craccivora, Coccinella
septempunctata, Hyadaphis
coriandri, Lipaphis
erysimi, Macrosiphum
rosae, Rhopalosiphum nymphae.
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