Premium
Laboratory and field survival of Spodoptera frugiperda (Lepidoptera: Noctuidae) on Bt and non‐Bt maize and its susceptibility to insecticides
Author(s) -
Muraro Dionei S,
Garlet Cinthia G,
Godoy Daniela N,
Cossa Gisele E,
Rodrigues Junior Gerson L dos S,
Stacke Regis F,
Medeiros Sandro LP,
Guedes Jerson VC,
Bernardi Oderlei
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.5347
Subject(s) - noctuidae , chlorfenapyr , biology , fall armyworm , spodoptera , pest analysis , beet armyworm , lepidoptera genitalia , integrated pest management , agronomy , larva , field corn , strain (injury) , pesticide , botany , zea mays , genetics , gene , recombinant dna , anatomy
BACKGROUND Field‐evolved resistance of fall armyworm (FAW), Spodoptera frugiperda (Smith), has been reported to Bt maize technologies in Brazil. The control failures of FAW by Bt maize increased the use of insecticides for their control. However, no information is available on the interaction between resistant FAW and their response to insecticides. Here, we evaluated the survival of FAW strains on Bt and non‐Bt maize in laboratory and field conditions, and their susceptibility to insecticides. RESULTS In the laboratory, resistant FAW larvae reared on Bt and non‐Bt maize showed a similar susceptibility to spinetoram (LC 50 = 0.16–0.18 µg a.i. cm −2 ) and chlorfenapyr (LC 50 = 0.17–0.20 µg a.i. cm −2 ). However, their susceptibility was lower than that of the susceptible strain reared on non‐Bt maize: LC 50 = 0.05 (spinetoram) and 0.08 (chlorfenapyr) µg a.i. cm −2 . In contrast, heterozygous strains had similar susceptibility to the susceptible strain. In field trials, no differences in FAW survival were detected between strains when the commercial dose of two insecticides was applied in Bt and non‐Bt maize. CONCLUSION FAW strains surviving on Bt and non‐Bt maize, at the same development stage, have similar susceptibility to insecticides. The integrated pest management practices and insect resistance management importance of these results are discussed. © 2019 Society of Chemical Industry