Spiromesifen resistance in Tetranychus urticae (Acari: Tetranychidae): Selection, stability, and monitoring

Autor: Rafael Sorrentino Minazzi Stocco, Bruce Veronez, Mário Eidi Sato, Maria Cristina Vitelli Queiroz, Rafaela Gallego
Rok vydání: 2016
Předmět:
Zdroj: Crop Protection. 89:278-283
ISSN: 0261-2194
DOI: 10.1016/j.cropro.2016.08.003
Popis: The two-spotted spider mite, Tetranychus urticae Koch, is an important pest of many agricultural crops. Studies on artificial selections, stability of resistance and monitoring of spiromesifen resistance were carried out to provide basic information for a spiromesifen resistance management program in T. urticae. Artificial laboratory selections for resistance to spiromesifen were performed in a population originating from a mixture of four field populations collected in commercial chrysanthemum fields in the State of Sao Paulo, Brazil. After 20 cycles of selection for spiromesifen resistance, the resistance ratio (RR50) reached 121. Spiromesifen resistance was shown to be unstable in the absence of selection pressure under laboratory conditions. The frequency of spiromesifen resistance decreased from 75 to 0.15% in six months. The evaluation of 23 T. urticae populations from several crops in the States of Goias, Mato Grosso and Sao Paulo in Brazil indicated that the susceptibility of the spider mites to spiromesifen was variable, with percentages of resistant mites ranging from 0.0 to 81.5%. The highest resistance frequencies were observed in ornamental plants (roses and chrysanthemum) in the State of Sao Paulo. Populations of T. urticae with up to 29.8% resistant mites were also detected in strawberry fields, in the same State. This is the first report on spiromesifen resistance in T. urticae on several crops in Brazil. Strategies for the management of acaricide resistance are discussed.
Databáze: OpenAIRE
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