Journal of Applied Entomology - Zeitschrift für angewandte Entomologie (2000) 124, 233-238

H.A.A. Siqueira, R.N.C. Guedes and M.C. Picanço (2000)
Cartap resistance and synergism in populations of Tuta absoluta (Lep., Gelechiidae)
Journal of Applied Entomology - Zeitschrift für angewandte Entomologie 124 (5-6), 233-238
Abstract: Control failures of cartap when used against the tomato leafminer Tuta absoluta (Meyrick) in Brazil and a recent report of cartap resistance in Brazilian populations of this pest species led to the investigation of the possible involvement of detoxification enzymes on this phenomenon using insecticide synergists. The insect populations were collected from seven different sites in the states of Minas Gerais, Rio de Janeiro and São Paulo. These populations were subjected to insecticide-impregnated filter paper assays. The concentration–mortality assays were carried out for cartap alone and in a mixture (1 cartap : 10 synergist) with the synergists diethyl maleate, piperonyl butoxide and triphenylphosphate which, respectively, inhibit the enzymes glutathion-S-transferases, cytochrome P450-dependent monooxygenases and esterases. Resistance to cartap was observed in all populations when compared with the standard susceptible population, with resistance ratios ranging from 2.3- to 21.9-fold. Piperonyl butoxide was the most efficient synergist with cartap synergism ratios ranging from 1.3- to 21.0-fold and nearly completely suppressing the resistance to cartap in all of the populations studied, suggesting a major involvement of cytochrome P450-dependent monooxygenases as a cartap resistance mechanism in these populations of T. absoluta. Diethyl maleate and triphenylphosphate also synergized cartap in nearly every population, and they still provided partial suppression of cartap resistance in the leafminer populations studied. Therefore, glutathion-S-transferases and esterases seem to play a secondary role in cartap resistance in Brazilian populations of T. absoluta.
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Link to article at publishers website
Database assignments for author(s): Herbert A.A. Siqueira, Raul Narciso C. Guedes, Marcelo Coutinho Picanco

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phthorimaea absoluta		Brazil (south)