The toxicity of selected acaricides against five stored product mites under laboratory assay

Abstract

In laboratory tests, the toxicity of acaricides targeted against house dust mites was tested on five species of stored product mites (Acarus siro, Aleuroglyphus ovatus, Carpoglyphus lactis, Lepidoglyphus destructor, and Tyroborus lini). The formulations of benzyl-benzoate, benzylbenzoate/permethrin/pyriproxyfen, and neem were diluted in water and applied to filter paper in an unventilated chamber. The mortality of mites was observed after 24 h of exposure to acaricide-impregnated filter paper. All of the tested acaricides were toxic to all of the mite species. There were significant differences in mortality among the species and the acaricides. Benzyl-benzoate/permethrin/pyriproxyfen was the most effective, followed by benzyl-benzoate and neem. L. destructor (LD 50 0.01-0.11 lg) was the most sensitive mite species, followed by A. siro (LD 50 0.04-0.12 lg), T. lini (LD 50 2-21 lg), A. ovatus (LD 50 3-18 lg), and C. lactis (LD 50 4-64 lg). Based on the highly toxic effects of the tested acaricides against the stored product mites, the acaricides should be considered as a potential tool in the control of stored product mites, although next screening is necessary.

The efficacy of four avermectins on the synanthropic mite Lepidoglyphus destructor under laboratory conditions

“…Benzyl-benzoate has been widely utilized (Colloff 2009). Azadirachta indica (neem tree) extracts and multicompound pyrethroids are also labeled for the control of house-dust mites, and a suppressive activity against certain other mites (A. siro and Aleuroglyphus ovatus) has been observed in laboratory experiments (Hubert et al 2007;Stara et al 2011). The observed suppressive effect of avermectins indicates that all of the tested formulas can be used to control synanthropic acaridid mites.…”

“…The points represent the actual data, the middle line is the fit, and the dashed lines indicate 95 % CI. Parameters (a, b, c) are given in Table 2 (Collins 2006;Stara et al 2011). Benzyl-benzoate has been widely utilized (Colloff 2009).…”

“…Our results confirmed previously published observations of the toxic effect of abamectin, one of the avermectins that is widely used as a broad-spectrum insecticide and acaricide. Abamectin is used to control A. siro, L. destructor and T. putrescentiae in laboratory experiments (Collins 2006;Stara et al 2011). In addition, we found that doramectin is the most effective avermertin tested.…”

“…In addition, certain species have developed resistance to some frequently used acaricides/insecticides, i.e., some strains of Acarus siro were found to be resistant to organophosphates (Szlendak et al 2000). This situation has encouraged the research and testing of the acaricidal activity of insecticides (Hubert et al 2007;Erban et al 2009;Stara et al 2010Stara et al , 2011 or the identification of acaricidal activities in available volatiles ) and essential oils Lee et al 2009). …”

“…Emamectin-benzoate has been successfully tested for the control of phytophagous pests in laboratory experiments (Ishaaya et al 2002). Abamectin has been tested against synanthropic mites and has shown efficacy in an impregnated filter paper bioassay for Tyrophagus putrescentiae (Stara et al 2011); after application to wheat, abamectin decreased the population growth of A. siro, Lepidoglyphus destructor (Astigmata: Glycyphagidae) and T. putrescentiae (Collins 2006). These results indicate the possible efficacy of avermectins in the control of synanthropic mites.…”