Premium
Lethal and sub‐lethal effects of spinosad on the life‐history traits of army worm, S podoptera litura ( F abricius) ( L epidoptera: N octuidae), and its fitness cost of resistance
Author(s) -
Rehan Adeel,
Freed Shoaib
Publication year - 2015
Publication title -
entomological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 20
eISSN - 1748-5967
pISSN - 1738-2297
DOI - 10.1111/1748-5967.12117
Subject(s) - spinosad , biology , spodoptera litura , lepidoptera genitalia , noctuidae , toxicology , pupa , population , pest analysis , larva , botany , ecology , pesticide , demography , sociology
S podoptera litura is one of the most destructive polyphagous insect pests, with more than 120 host‐plant species. In our present study, a field‐collected population of S. litura when selected with spinosad for 11 consecutive generations resulted in the development of 3921‐fold resistance to spinosad as compared to the susceptible strain. The spinosad‐resistant strain of S. litura had a relatively high fitness cost (0.17) as compared to the susceptible strain. Furthermore, the lethal and sub‐lethal effects of different concentrations of spinosad were checked on the susceptible strain at different levels; i.e., LC 40 , LC 30 , LC 20 and LC 10 , which revealed that the impact of spinosad on the life‐history traits of S. litura increased with the increase in concentration of spinosad. A significant impact of spinosad was recorded on the larval duration, pre‐pupal weight, pupal duration, pupal weight, reproductive potential and adult emergence. The outcomes of the current research clearly indicate that fitness cost of spinosad and its sub‐lethal effects have a significant impact on population dynamics of S. litura , for which it can be incorporated in integrated pest management.