Resumo

RODRIGUEZ-SOTO, Juan Carlos; SALAZAR CASTILLO, Marco Leoncio  e  CONTRERAS QUINONES, Marisol. Effect of different surfactants on larvae III of Spodoptera frugiperda Smith under laboratory and field conditions. Arnaldoa [online]. 2018, vol.25, n.3, pp.1041-1052. ISSN 1815-8242.  http://dx.doi.org/10.22497/arnaldoa.253.25315.

Zea mays L. is a global economically important crop; nevertheless, it is affected by various plagues, with Spodoptera frugiperda Smith as its key plague. This insect larva is called "cogollero" since it attacks the young sprouts putting in risk the development of the maize. The disproportionate use of insecticides for its control is not able to eliminate the resistance developed by this insect and disagree with the care of the environment, which was the reason to expose larvae III of S. frugiperda to different surfactant concentrations as dimethyl sulfoxide (DMSO) and Tween 80, habitually employed in different industries for their tensoactive, adherent, detergent and low residual properties. We developed an experimental design with random blocks, in laboratory and field. The concentrations employed in laboratory were three of DMSO (0,3 %; 0.4 %; 0.6 %) and three of Tween 80 (0,1 %; 0,2 %; 0,3 %), besides a control (0 %). T4 (0,6 % DMSO) promoted a larva mortality of 83,33 %, and T7 (Tween 80 0,3 %) reached 90 %. On field conditions, a different control treatment was used (600 g/L of methamidophos). The commercial version and the 0,6 % of DMSO reached a larva mortality media of 76 %. In conclusion, the higher the surfactant concentration, the higher the larva mortality is. Likewise, the longer the time of exposure, the larva mortality is more likely to increase.

Palavras-chave : Spodoptera frugiperda Smith; larvicide; dimethyl sulfoxide; Tween 80; Zea mays L.

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