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VALDEZ Susana Ruth

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Título:

Particulate Nanoinsecticides: A New Concept in Insect Pest Management

Autor/es:

STADLER TEODORO; BUTELER MICAELA; VALDEZ SUSANA R; GITTO JAVIER G

Libro:

Insecticides - Agriculture and Toxicology

Editorial:

INTECHOPEN LIMITED

Referencias:

Lugar: Londres; Año: 2018; p. 1 - 140

Resumen:

Nanostructured alumina (NSA) hasinsecticidal properties and has been demonstrated to be effective againststored product insect pests in laboratory bioassays. NSA is a nanoengineeredmaterial synthesized by oxidation of metals, and resulting particles show fixedelectric charges. On the other hand, insects exhibit their own electric chargesgenerated by triboelectrification. We propose that the mechanism of action ofNSA involves two steps occurring in sequential order. First, a strongelectrical binding between negatively charged NSA particles and positivelycharged insect. Next, dehydration of the insect occurs due to the strongsorbtive action of the NSA particles that remove the insecto cuticular, leadingto death by dehydration. As postulated for insecticidal inert powder ingenerals, particles attach to theinsect cuticle surface disrupting water balance, and effectiveness decreases asambient humidity increases, given that electrostatic bond forces are reduced byelectrostatic discharge. The high insecticidal efficacy of NSA is a result ofits intrinsic electric charge, small particle size and high sorptive potentialdue to its large specific surface area. NSA could provide an alternative toconventional synthetic organic insecticides due to its strong insecticidalproperties with the advantage that its mechanism of action involves physicaland electrostatic phenomena.

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