Acetylcholinesterase Activity Associated with Methiocarb Resistance in a Strain of Western Flower Thrips,Frankliniella occidentalis(Pergande)

Toxic effects of molluscicidal baits to the terrestrial isopod Porcellionides pruinosus (Brandt, 1833)

“…The application of methiocarb strongly inhibited AChE activity being reduced after 1 h of exposure to almost 50% compared to the control. This drastic inhibition of AChE activity surely can be linked with the mode of action of the carbamate methiocarb, which is designed specifically to inhibit this enzyme, as it was attested by several research papers concerning the effects of this pesticide in AChE activity of various non-target species (Taylor 1996;Wellman and Heimbach 1996;Jensen 1998;Hyne and Maher 2003;Boran et al 2007;Radwan et al 2008). The strong decrease in AChE activity within a small exposure period is also in agreement with previous studies that illustrated the decrease in the activity of this enzyme when terrestrial isopods were exposed to organophosphate insecticides, that have a similar inhibitory influence in AChE as carbamates, even at sub-lethal concentrations (Fischer et al 1997;Ribeiro et al 1999;Stanek et al 2003;Engenheiro et al 2005).…”

Evaluation of Insecticides Against the Western Flower Thrips,Frankliniella occidentals(Thysanoptera: Thripidae), in the Laboratory

“…The western flower thrips is a highly polyphagous insect, attacking more than 240 species in 62 plant families (Lim et al 2001). The insect's host range includes open-field ornamental, orchard, garden, and field crops, as well as other plants (Jensen 2000;Yudin et al 1986). Frankliniella occidentalis directly damages plants by feeding and oviposition.…”

Selection and Reversion of Azamethiphos-Resistance in a Field Population of the Housefly <I>Musca domestica</I> (Diptera: Muscidae), and the Underlying Biochemical Mechanisms

“…However, speciÞc activity was much higher in the 594vb strain. High AChE activity has been associated with a number of cases of resistance in different insect species (Fournier et al 1992, Guedes et al 1997, Jensen 1998, and it may contribute to the resistance seen in this strain. Unlike the detoxiÞcation systems discussed above, the AChE activity and inhibition proÞle remained stable after selection ( Table 4).…”