Reproduction and demography of an Aphidophagous ladybird, Hippodamia variegata on six aphid species
We tested six aphid species, viz. Aphis gossypii , Aphis craccivora , Brevicoryne brassicae , Lipaphis erysimi , Myzus persicae and Uroleucon compositae as essential foods needed for the reproduction and demography of an aphidophagous ladybird, Hippodamia variegata . Females were highly fecund (1210...
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Veröffentlicht in: | International journal of tropical insect science 2020, Vol.40 (3), p.541-548 |
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Sprache: | eng |
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Zusammenfassung: | We tested six aphid species, viz.
Aphis gossypii
,
Aphis craccivora
,
Brevicoryne brassicae
,
Lipaphis erysimi
,
Myzus persicae
and
Uroleucon compositae
as essential foods needed for the reproduction and demography of an aphidophagous ladybird,
Hippodamia variegata
. Females were highly fecund (1210.8 ± 55.31 eggs) with prolonged oviposition period (56.30 ± 2.36 days) and laying most viable eggs (92.91 ± 0.81%) when fed on
A. gossypii
(reared on
Lagenaria vulgaris
) with the highest net reproductive rate (449.45 ± 20.53 females / female).
Aphis craccivora
(raised on
Dolichos lablab
) supported optimal value for intrinsic rate of increase (0.183 ± 0.003) with the shortest generation time (32.40 ± 0.557 days). Other diets didn’t show improved performance but quantified as essential foods.
Brassica
hosted
B. brassicae
and
L. erysimi
were less suitable but not the rejected prey. Age-specific fecundity of female
H. variegata
was triangular in function with peak oviposition during her early reproductive age when fed on either
A. gossypii
,
A. craccivora
,
U. compositae
or
M. persicae
, while peak skewed towards later reproductive age when fed on
B. brassicae
or
L. erysimi.
Fecundity was positively correlated with egg-viability and oviposition period. We used jackknife technique to estimate and compare the demographic parameters within the groups. High values of intrinsic and finite rates of increase on
A. gossypii
and
A. craccivora
affirm their suitability for augmentative rearing of
H. variegata.
We conclude that both
A. gossypii
and
A. craccivora
on above respective host-plants are highly suitable aphid-diets for mass-multiplication of
H. variegata
. |
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ISSN: | 1742-7592 1742-7584 1742-7592 |
DOI: | 10.1007/s42690-020-00101-2 |