Pest Management Science (2015) 71, 537-544

Mateus R. Campos, Tadeu B.M. Silva, Wellington M. Silva, Jefferson E. Silva and Herbert A.A. Siqueira (2015)
Susceptibility of Tuta absoluta (Lepidoptera: Gelechiidae) Brazilian populations to ryanodine receptor modulators
Pest Management Science 71 (4), 537-544
Abstract:
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 (LC₅₀ values varied from 3.17 to 29.64 µg AI L^-1), cyantraniliprole (LC₅₀ values varied from 8.61 to 28.95 µg AI L^-1) and flubendiamide (LC₅₀ 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 LC₅₀ values among themselves, suggesting a high risk of cross-resistance. However, the log LC₅₀ 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 LC₅₀ 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Herbert A.A. Siqueira

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phthorimaea absoluta