Age-Stage, Two-Sex Life Table Study of the Effects of Sub-Lethal Concentrations of Novaluron on Earias vittella (Lepidoptera: Noctuidae) | [International Journal of Agriculture and Biology • 2022]

Author(s):

1. Dilawar Khan: Department of Entomology, Pir-Meher Ali Shah Arid Agriculture University,Rawalpindi, Punjab,Pakistan

2. Bilal Rasool: Departement of Zoology, Faculty of Life Sciences, Government College University Faisalabad,Punjab,Pakistan

3. Asim Gulzar: Department of Entomology, Pir-Meher Ali Shah Arid Agriculture University,Rawalpindi, Punjab,Pakistan

4. Muhammad Tariq: Department of Entomology, Pir-Meher Ali Shah Arid Agriculture University,Rawalpindi, Punjab,Pakistan

5. Sobia Khaliq: Department of Entomology, Pir-Meher Ali Shah Arid Agriculture University,Rawalpindi, Punjab,Pakistan

6. Ihsan ul Haq: Directorate of Agricultural Planning,Quetta, Balochistan,Pakistan

7. Sakhawat Ali: Directorate of Vegetable Seed Farm Agriculture Research Institute,Quetta, Balochistan,Pakistan

Abstract:

Earias vittella (F) is an important insect pest of cotton (Gossypium hirsutum) and okra (Abelmoschus esculentus) in Pakistan. The current study was carried out to explore the effects of sub-lethal concentrations of novaluron on the life table parameters of the pest. Bioassays were performed to assess the sub-lethal concentrations (LC20 and LC50) of the novaluron and its effects on the demographic parameters of the E. vittella. Age-stage, two-sex life table theory was applied to interpret the data for population parameters of E. vitella. In the current study, the LC20 and LC50 were calculated as 2.224 ppm and 9.837 ppm, respectively. The results showed that in novaluron treated samples rates of all biological parameters decreased whereas the larval, pupal period and mean generation time were increased. The intrinsic rate of increase remained high in control as 0.166 d-1 in comparison with LC50 as 0.128 d-1. The net reproductive rate ranged from 94.542 offsprings per individual (control) to 61.228 offsprings per individual (LC50). Fecundity was dropped in insects treated with sub-lethal concentrations from 330.9 eggs per female (control) to 238.11 eggs per female (LC50). This study revealed that the sub-lethal concentrations of novaluron significantly decreased the biological rate of E. vitella under laboratory conditions and suggests that such doses should be practiced in the fields for proper integrated pest management strategies.

Page(s): 147-153

DOI: 10.17957/IJAB/15.1911

Published: Journal: International Journal of Agriculture and Biology, Volume: 27, Issue: 2, Year: 2022

Keywords:

Twosex life table , sublethal concentration , Insect growth regulator , Eairas vittella , Novaluron

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