title: Bacillus thuringiensis var. tenebrionis control of synanthropic mites (Acari: Acaridida) under laboratory conditions.
abstract: Bacillus thuringiensis (Bt) toxins present a potential for control of pest mites. Information concerning the effect of Bt and its possible application to the biocontrol of synathropic mites is rare. The toxic effect of Bacillus thuringiensis var. tenebrionis producing Cry3A toxin was tested on the mites Acarus siro L., Tyrophagus putrescentiae (Schrank), Dermatophagoides farinae Hughes, and Lepidoglyphus destructor (Schrank) via feeding tests. Fifty mites were reared on Bt additive diets in concentrations that ranged from 0 to 100 mg g(-1) under optimal conditions for their development. After 21 days, the mites were counted and the final populations were analyzed using a polynomial regression model. The Bt diet suppressed population growth of the four mite species. The fitted doses of Bt for 50% suppression of population growth were diets ranging from 25 to 38 mg g(-1). There were no remarkable differences among species. Possible applications of Bt for the control of synanthropic mites are discussed.
authors.affiliation: Crop Research Institute, Drnovska 507, 16106, Praha 6-Ruzyne, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Erban
authors.forename: Marta
authors.initials: M
authors.lastname: Nesvorna
authors.forename: Michaela
authors.initials: M
authors.lastname: Erbanova
authors.forename: Jan
authors.initials: J
authors.lastname: Hubert
mesh_terms: D056810:Acaricides; D000818:Animals; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; D008925:Mites; D010572:Pest Control, Biological; D013045:Species Specificity
chemical_list: D056810:Acaricides; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis