Resumo

ROBLES-BERMUDEZ, Agustín et al. Resistance of four population mites (Tetranychus urticae Koch.) to propargite in cut rose (Rosa x hybrida) in the State of Mexico, Mexico. Rev. Mex. Cienc. Agríc [online]. 2012, vol.3, n.4, pp.785-795. ISSN 2007-0934.

The spider mite, Tetranychus urticae Koch., is one of the most important pests of cut rose (Rosa x hybrida) in the State of México and, its primary control it's through the use of acaricides, such as propargite; the producers initially used it with satisfactory results and currently it does not control this pest anymore. In order to estimate the level of resistance to that acaricide, in 2007, its response to this acaricide was assessed in populations from Coatepec Harinas, Tenancingo, Villa Guerrero and Zumpahuacán, State of México. In each locality at least 4 000 nymphs and 2 000 adults were collected in the cut rose cultivation in greenhouses and were reproduced to F1 for the bioassays. The dose range that eliminated 0 to 100% of the treated individuals was determined (biological window). Subsequently, from five to seven concentrations were included covering the range. Five repetitions were made, four in different consecutive days. Spider mite populations from Coatepec Harinas (RR₉₅= 7.9X, Villa Guerrero (RR₉₅= 1.3 X and Zumpahuacán (RR₉₅= 11X) are considered susceptible to propargite; while the population of Tenancingo (RR₉₅= 90. IX) is considered resistant to the acaricide.

Palavras-chave : spider mites; bioassay; Potter tower.

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