Life tables and the intrinsic rate of increase of Earias vittella (Lepidoptera: Noctuidae) reared on different hosts

Abstract

Life table studies of Earias vittella (Fabricius) on different hosts in the Insect Biotech Laboratory, Department of Entomology, Dr PDKV Akola, revealed that survival (lx) of immature stages of E. vittella on different hosts was 0.65 on okra, 0.56 on cotton, 0.54 on semi-synthetic diet and 0.51 on mesta. The net reproductive rate (Ro), at the end of each generation, of E. vittella was 81.91 on okra, 56.70 on cotton, 53.02 on semi-synthetic diet and 36.63 on mesta (Hibiscus cannabinus L.). The net reproductive rate (Ro) followed the same order as the survival rate (lx) on the different hosts. The innate capacity for increase in numbers (rm) ranged between 0.0888 and 0.1334 females/female/day. In descending order, the rm values on different hosts were okra (0.1334), cotton (0.1111), semi-synthetic diet (0.1029) and mesta (0.0888).Résumé. L'étude de la table de vie de E. vittella (Fabricius) élevé sur différentes plantes hô tes et sur milieu artificiel au laboratoire de Biotechnologie des insectes, du département d'entomologie (Dr PDKV Akola), a révélé que le taux de survie (lx) des stades immatures d' E. vittella sur les différents substrats est de 0,65 sur gombo, 0,56 sur coton, 054 sur milieu artificiel et 0,51 sur mesta (Hibiscus cannabinus L.). Le taux net de reproduction (Ro) d'E vittella par génération est de 81,91 sur gombo, 56,70 sur coton, 53,02 sur milieu artificiel et de 36,63 sur mesta. On observe une évolution comparable du taux net de reproduction (Ro) et du taux de survie sur les différents substrats. La capacité innée d'accroissement (rm) est comprise entre 0,0888 et 0,1334 femelles/femelle/jour. Les valeurs du rm sont par ordre décroissant 0,1334 (gombo), 0,1111 (coton), 0,1029 (milieu semi synthétique) et 0,0888 (mesta). Mots clés: table de vie, plante hô te, taux de survie, capacité innée d'accroissement, taux net de reproduction, Earias vittella, gombo, coton, Hibiscus cannabinus *

Potential for Population Growth of the Small Hive BeetleAethina tumida(Coleoptera: Nitidulidae) on Diets of Pollen Dough and Oranges

“…At 25.2°C, (the optimum except for Malus), r ranged from 0.146 on the best host (Rumex) to 0.080 on the poorest (Trifolium). The spotted boll-worm, Earias vittella (F.), is a major pest of cotton but also feeds on a number of alternative hosts, including okra and mesta (kenaf), Hibiscus cannabinus L. Satpute et al (2005) reported r values of 0.1334 on okra, 0.1111 on cotton, and 0.0888 on mesta. Nanthagopal & Utamasamy (1989) found that the r value of E. vittella also varies with species of cotton: 0.1960 on Gossypium barbadense L., 0.1928 on G. hirsutum L., 0.1175 on G. herbaceum L., and 0.0877 on G. arboretum L.…”

Population Growth Potential of the Bed Bug, Cimex lectularius L.: A Life Table Analysis

“…Life tables are also used to determine the age structure of the population, reproductive contribution of the different life stages to future population size, and the maximal rate of increase at any particular combination of environmental factors [ 15 , 16 ]. It is not surprising, then, that in the entomological literature, one can find studies of the development and application of life tables for species in many orders including Lepidoptera [ 17 , 18 ], Diptera [ 19 , 20 ], and Hymenoptera [ 21 ]. Life tables have also been used to study the life history of mite species [ 22 ].…”

Biology and lifetable of whitebacked planthopper Sogatella furcifera (Horvath) on rice

“…The rm, T c and DT are useful in dices of population growth of S. furcifera on one of the most susceptible variety MTU 7029 during wet season in West Bengal. The rm value of a life table data of a particular species provide insight into characteristic life patterns of different species (Satpute et al 2005). The intrinsic birth rate and death rate varied with some biotic and abiotic factors.…”