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Fitness costs associated with chlorantraniliprole resistance in Spodoptera exigua (Lepidoptera: Noctuidae)
Author(s) -
Liu Shuhua,
Yao Xinge,
Xiang Xing,
Yang Qunfang,
Wang Xuegui,
Xin Tian,
Yu Siyuan
Publication year - 2021
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.6194
Subject(s) - fecundity , exigua , lepidoptera genitalia , biology , spodoptera , noctuidae , heritability , population , zoology , pest analysis , population dynamics , ecology , botany , demography , genetics , gene , sociology , recombinant dna
Abstract BACKGROUND The field population of Spodoptera exigua , an intermittently occurring polyphagous pest, has developed resistance to chlorantraniliprole, while whether or not such resistance carries fitness costs remains poorly understood. Here we selected six generations of the Leshan population (LS‐P) by two‐way selecting method, and obtained a highly resistant strain (CH‐RE) and resistant degeneration strain (CH‐SE) sharing a similar genetic background. After that fitness costs were evaluated by comparing the life history characteristics of CH‐RE, CH‐SE and the laboratory susceptible strain (SE‐Lab) via the age‐stage two‐sex life table method. RESULTS The resistance ratio of CH‐RE and CH‐SE were 226.69‐fold and 3.72‐fold, respectively, and the estimated realized heritability ( h 2 ) of CH‐RE was 0.058. Compared with CH‐SE, the duration of pre‐adult, the longevity of adult, adult preoviposition period (APOP) and average generation time ( T ) of CH‐RE had significantly increased, but the oviposition days, average fecundity, intrinsic growth rate ( r ), weekly growth rate ( λ ) and reproductive rate ( R 0 ) decreased significantly. Moreover, the relative fitness of CH‐RE was 0.25, and showed fitness costs. Concurrently, the fecundity of CH‐SE was slightly lower than SE‐Lab, but there was no significant difference in r , λ and R 0 , and the fitness (1) of CH‐SE was similar to SE‐Lab (1.02), which was no fitness cost. CONCLUSION These findings represent that chlorantraniliprole resistance in S. exigua has a fitness cost, and the fitness cost will disappear with the recovery of sensitivity when the insecticide is stopped for field populations, supporting that such resistance would be managed by switching off the selection pressure with rotation with alternate insecticides. © 2020 Society of Chemical Industry