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The Intrinsic Rate of Natural Increase and the Life Expectancy of Lipaphis Erysimi (Kalt.) on Mustard in India

Published online by Cambridge University Press:  19 September 2011

S. C. Goel  and
Bhopal Singh
S. C. Goel
Affiliation:
PG-Department of Zoology, S.D. College, Muzaffarnagar-251001, India
Bhopal Singh
Affiliation:
PG-Department of Zoology, S.D. College, Muzaffarnagar-251001, India
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Abstract

A life table was constructed for the mustard aphid, L. erysimi during January, February and March corresponding to 14 ± 2°C, 16 ± 2°C, 20 ± 2°C and 74 ± 5%, 74 ± 6% and 54 ± 5% R. H. under laboratory conditions. The study revealed that the values of intrinsic rate of natural increase (rm) and finite rate of increase (λ;) were 0.1035, 0.096, 0.023 and 1.109, 1.101, 1.023 females/female/day. The doubling time (DT) was higher in the case of alate morph during March (13.088 days) than apterous morph during January (6.697 days) and February (7.220 days). On reaching the population at a stable age distribution, the nymphal population estimated was 84.36, 93.87 and 92.67 in January, February and March respectively. The life expectancy (ex) of newly born nymphs of L. erysimi declines monotonically with advancing of age in these months.

Résumé

Une table de survie a été construite pour le pourceron de la mustarde pendant Janvier, février et mars correspondents à 14 ± 2°C, 16 ± 2°C, 20 ± 2°C et 74 ± 5%, 74 ± 6% et 54 ± 5% H.R. sous des conditions de laboratoire. L'étude a révelé que les valeurs du taux intrinsèque de la croissement naturelle (rm) et du taux fini d'accroissement (L) étaient 0,1035, 0,096, 0,023 et 1,109, 1,101, 1,023 femelles/femelie/jour. Le temps de redoublement (DT) était plus haut dans le cas du morphe alate pendant mars (13,088 jours) que dans le cas du morphe apère pendant janvier (6,697 jours) et février (7,220 jours). On atteinant la population à une distribution stable d'âge, la population nymphale estimée était 84, 36, 93, 87 et 92, 67 en janvier, février et mars respectivement L'espérance de vie des nymphes nouveau-nées de L. erysimi décline d'une manière monotone avec l'age dans ces mois.

Keywords

Intrinsic ratenatural increaselife expectancyLipaphis erysimimustardTaux intrinsèqueaccroissement naturelleespérance de vieLipaphis erysimimoutarde
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 3 , June 1994 , pp. 287 - 291
Copyright
Copyright © ICIPE 1994

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