Effect of some Brassica genotypes on development and reproduction of mustard aphid, lipaphis erysimi (Kalt.) and its predator, coccinella septempunctata (L.)
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Date
2009
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Publisher
CCSHAU
Abstract
An experiment was conducted during the ‘Rabi’ season 2008-09 at Chaudhary
Charan Singh Haryana Agricultural University, Hisar. Development and reproduction
of L. erysimi (Kalt.) and its predator C. septempunctata (L.) were studied on different
four Brassica species comprising each, two genotypes of rapeseed mustard viz.,
Brassica campestris ( BSH and YST 151 ), B. juncea ( RH 30 and RH 9501), B. carinata
(HC 212 and DLSC 2 ) and B. napus ( HNS 9605 and TERI (00) R 9903). The above
studies were conducted at three plant growth stages on different plant parts, i.e. sixth
leaf plant stage (20-25 days after germination), grown up plant stage (45-50 DAG) and
full flowering/pod formation stage (65-70 DAG).
At sixth leaf plant stage (20-25 DAG) the nymphal development of L. erysimi
was faster (8.3 days) on TERI (00) R 9903, the average adult longevity and fecundity
per female were maximum (18.6 days and 100.3 nymphs) as compared to other
genotypes and it was because of low glucosinolates (GLS) (25.10 μ mole/g defatted
meal). On HNS 9605, the mustard aphid had maximum nymphal period (9.8 days),
lowest adult longevity (17.5 days) and minimum fecundity per female (68.9 nymphs)
closely followed by DLSC 2 due to high amount of GLS (54.30 μ mole/g defatted meal)
in genotype, HNS 9605 and DLSC 2. Similar trend was also observed at grown-up
plant stage (45-50 DAG) and at full flowering/pod formation stage (65-70 DAG) for L.
erysimi development and reproduction.
Development and feeding potential of C. septempunctata was studied under
laboratory conditions on L. erysimi reared on different rapeseed mustard genotypes.
pre-oviposition period, oviposition period, post-oviposition period, fecundity per
female and sex ratio were varied from 3.5 to 7.3, 13.5 to 16.5, 2.8 to 4.8 days, 368.5
to 550.0 eggs per female and 1:1.3 to 1:1.7, respectively. It was minimum on
genotype, HNS 9605 and maximum on TERI (00) R 9903. The incubation period, total
period of grub instar, pupal period, male and female adult longevity were recorded
maximum (4.6, 11.4, 4.6, 22.5 and 28.6 days, respectively) on genotype, TERI (00) R
9903 and minimum (3.8, 10.0, 3.8, 17.8 and 19.3 days, respectively) on HNS 9605.
The total number of aphids consumed by a grub C. septempunctata to become
pupa varied from 301.8 to 359.5 aphids and it was minimum on genotype, HNS 9605
and maximum on TERI (00) R 9903. While, male and female adults of C.
septempunctata were also consumed minimum number of aphids (1773.5 and 1984.7
aphids) on genotype, HNS 9605 and consumed maximum number of aphids (2038.4
and 2490.2 aphids) on genotype, TERI (00) R 9903.
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Keywords
Bacteria, Azotobacter, Sowing, Planting, Insecticides, Biological development, Pesticides, Biofertilizers, Wheats, Wood