Premium
Fitness costs of Vip3A resistance in Spodoptera frugiperda on different hosts
Author(s) -
Chen Xuan,
Head Graham P,
Price Paula,
Kerns David L,
Rice Marlin E,
Huang Fangneng,
Gilreath Ryan T,
Yang Fei
Publication year - 2019
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.5218
Subject(s) - spodoptera , fall armyworm , biology , fecundity , pest analysis , pupa , sorghum , lepidoptera genitalia , population , bacillus thuringiensis , veterinary medicine , agronomy , toxicology , larva , botany , genetics , demography , medicine , gene , bacteria , recombinant dna , sociology
BACKGROUND Fall armyworm, Spodoptera frugiperda , is a major target pest of the Vip3A protein. The fitness of Bacillus thuringiensis (Bt)‐resistant insects on refuges is an important factor in determining the speed of resistance development. Fitness costs associated with Bt resistance can vary among host plants. Here, we provide the first experimental evaluation of the interactions between non‐Bt hosts and fitness costs of Vip3A resistance in S. frugiperda . RESULTS Laboratory bioassays showed that survivorship, pupal weight, sex ratio, developmental time, fecundity, net reproductive rate, and intrinsic rate were not different among Vip3A‐resistant (RR), ‐susceptible (SS) and ‐heterozygous (R ♂ S ♀ and R ♀ S ♂ ) strains of S. frugiperda on non‐Bt corn, non‐Bt cotton, and non‐Bt diet. R ♂ S ♀ and R ♀ S ♂ also showed no differences on sorghum relative to SS. However, compared to SS, RR on sorghum showed significant reduction in pupal weight, and took longer time to develop to pupa and adult. CONCLUSION These findings suggest that recessive fitness costs of reduced pupal weight and growth rate were detected at the individual level in the Vip3A resistant populations of S. frugiperda on sorghum. However, at the population level in terms of net reproductive rate and intrinsic rate, fitness costs of Vip3A resistance was not evident in S. frugiperda . © 2018 Society of Chemical Industry