EFECTO DE ACARICIDAS QUÍMICOS EN LA MORTALIDAD DE LA ARAÑA ROJA Tetranychus urticae KOCH (Acari: Tetranychidae)

Abstract

<p><strong>Background.</strong> Chemical acaricides with different modes of action are an effective alternative for the management of <em>T. urticae</em> and to prevent the selection of resistant population. Objective. To evaluate the effect of chemical acaricides of different toxicological groups on the mortality of <em>T. urticae</em>. <strong>Methodology.</strong> To evaluate the acute toxicity, mites were exposed to leaf discs of eggplants that had been immersed in the acaricides. The mortality was recorded at 4 h period for a total of 48 h. To evaluate the residual effect, the acaricides were applied to eggplant plants, leaf discs were obtained at different periods (1 - 32 days after acaricide application) and <em>T. urticae</em> adults and nymphs were exposed to the leaf discs. <strong>Results</strong>. Abamectin, spirodiclofen and fenpyroximate had the fastest effects in adults and nymphs (4 h after application). Abamectin, spirodiclofen and fenpyroximate had long-term effects, for up to two weeks. Spirodiclofen, fenpyroximate and acequinocyl had also ovicidal effect. <strong>Implication.</strong> Chemical acaricides with different mode of action represent a viable option for the management of <em>T. urticae</em> and the prevention of the selection of resistant populations. <strong>Conclusión.</strong> Abamectin, spirodiclofen, and fenpyroximate are highly toxic against adults and immature <em>T. urticae</em>.</p>