Singh, S.K. and Yadav, D.K.
(2009)
Life table and biotic potential of Helicoverpa armigera
(hübner) on chick pea Pods.
Annals of plant Protection Science, 17 (1).
pp. 90-93.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
|
Abstract
Investigation on life fecundity tables and age specific distribution revealed that the expectancy of
newly laid eggs was 332.43. The survival of immature stages was 0.39. The main length of
generation was 42.62 days. The intrinsic rate of natural increase in number (rm) was 0.136 females/
female days. The number that survived from egg to adults was 78 individuals. Under sufficient
food supply, the population of H.armigera increased with and infinitesimal rate (rm) of 0.135
and finite rate (λ) 1.1459 females/female/days. A generation was completed in 42.62 days. The
population was able to multiply 332.43 times/generation on chick pea pods. The population on
reaching a stable age distribution comprised approximately 99 % of immature stage. The expectation
of further life at the age interval of 34 to 49 days was reduced to 4.85 days from 14.78 days in
beginning. Age distribution of this pest on chick pea manifested that eggs and larvae contributed
the highest to the population of stable age, where as the contribution of pupa and adult was
negligible.
Actions (login required)
 |
View Item |
