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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Stability and fitness costs associated with etoxazole resistance in Tetranychus urticae (Acari: Tetranychidae)

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Minazzi Stocco, Rafael Sorrentino [1] ; Sato, Mario Eidi [1] ; Santos, Taiana Lumi [1]
Total Authors: 3
[1] APTA, Inst Biol, Caixa Postal 70, BR-13001970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Experimental and Applied Acarology; v. 69, n. 4, p. 413-425, AUG 2016.
Web of Science Citations: 2

The two-spotted spider mite, Tetranychus urticae Koch, is one of the most important pests on a wide range of crops worldwide. Studies on stability of resistance and possible fitness costs associated with etoxazole resistance were carried out in T. urticae to provide basic information necessary to define effective acaricide resistance management strategies for this pest. Selection for resistance to etoxazole was performed in a population of T. urticae collected from a commercial rose field, in Holambra County, in the State of So Paulo, Brazil. After five rounds of selection for resistance, the resistance ratio (R/S) at the LC50 reached 8739 fold value in comparison with a susceptible strain (Brazabrantes S Strain). The stability of etoxazole resistance was studied under laboratory conditions, using a population with initial frequency of 75 % of resistant mites. The frequencies of etoxazole resistance were evaluated monthly for a period of 13 months. The frequency of etoxazole resistance decreased from 75 to 37 % in this period. Comparison of biological traits between resistant and susceptible strains indicated the presence of fitness costs associated with etoxazole resistance. The resistant strain showed lower fecundity and a higher proportion of males in the population. The figures for net reproductive rate (R (0)), intrinsic rate of natural increase (r (m)) and finite rate of increase (lambda) were higher in the susceptible strain. The instability of etoxazole resistance is a favorable aspect for the acaricide resistance management in the spider mite. (AU)

FAPESP's process: 12/17972-2 - Pesticide resistance in pests (Tetranychus urticae and Frankliniella occidentalis) and predators (Acari: Phytoseiidae) and management strategies for these pests
Grantee:Mário Eidi Sato
Support type: Regular Research Grants