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Susceptibility of Tuta absoluta (Lepidoptera: Gelechiidae) Brazilian populations to ryanodine receptor modulators
Author(s) -
Campos Mateus R,
Silva Tadeu BM,
Silva Wellington M,
Silva Jefferson E,
Siqueira Herbert AA
Publication year - 2015
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.3835
Subject(s) - tuta absoluta , gelechiidae , lepidoptera genitalia , biology , pest analysis , imperatorin , botany , chemistry , chromatography , high performance liquid chromatography
BACKGROUND Phthalic and anthranilic diamides comprise a new insecticide class recently registered in Brazil to control Lepidoptera such as Tuta absoluta (Meyrick). Therefore, the baseline of susceptibility was determined for eight representative field populations of this species to establish a resistance monitoring programme. The potential for cross‐resistance as well as detoxification metabolism was assessed in order to fine‐tune the resistance management programme. RESULTS Brazilian populations were very susceptible to chlorantraniliprole (LC 50 values varied from 3.17 to 29.64 µg AI L −1 ), cyantraniliprole (LC 50 values varied from 8.61 to 28.95 µg AI L −1 ) and flubendiamide (LC 50 values varied from 94 to 230 µg AI L −1 ), with respective resistance ratios of 9.33‐, 3.36‐ and 2.45‐fold between most susceptible and tolerant populations. Anthranilic diamides showed significant correlations between log LC 50 values among themselves, suggesting a high risk of cross‐resistance. However, the log LC 50 values of T. absoluta to phthalic diamide did not show any correlation with anthranilic diamides. Cytochrome‐ P450‐dependent monooxygenase activity showed a weak correlation with log LC 50 values of T. absoluta populations to anthranilic diamides, which suggests a potential route for evolving resistance to anthranilic diamides. CONCLUSION The diamides were highly effective against T. absoluta , with populations showing a homogeneous response to them. Cross‐resistance is very likely between anthranilic diamides in T. absoluta . Populations of this pest may evolve resistance by increasing cytochrome‐ P450‐dependent monooxygenases. © 2014 Society of Chemical Industry