Biological activity of Bacillus thuringiensis strains against larvae of the Blowfly Chrysomya putoria (Wiedemann) (Diptera: Calliphoridae)

Abstract

Neotropical Entomology 35(6): 849-852 (2006) ABSTRACT -Different strains of Bacillus thuringiensis Berliner were proved to be a powerful biologic insecticide against larvae of several insect orders. Due to the epidemiological importance of blowfl ies of the Chrysomya Robineau-Desvoidy genus in the production of secondary cutaneous myiasis and mechanic transmission of pathogenic agents, the performance of two strains of B. thuringiensis (LFB-FIOCRUZ 907 and LFB-FIOCRUZ 856) was tested against larvae of Chrysomya putoria (Wiedemann). The LFB-FIOCRUZ 907strain was tested in four different concentrations, added to the diet; the LFB-FIOCRUZ 856 strain was tested in three concentrations. C. putoria larvae showed sensibility to the treatment with the LFB-FIOCRUZ 907 strain at the tested concentrations. The higher concentration presented the best effi ciency, causing higher mortality and reducing larval weight and adult emergence more intensely. The LFB-FIOCRUZ 856 strain showed low toxicity, sliglity reducing emergence time of adults at 326 mg/ 25 g concentration and larval weight at 326 mg/ 25 g and 86 mg/ 25 g concentrations.

A study of the effect of Bacillus thuringiensis serotype H14 (subspecies israelensis)delta endotoxin on Musca larva

“…If these crystals are ingested by susceptible insects, they cause serious injuries or death (11). Several researchers have studied the effect of these toxins on the reproduction and growth of the house fly (5,6,11). In this study, we studied the effect of a protein crystal toxin derived from B. thuringiensis serotype H14 (subspecies israelensis) on the larvae of house flies.…”

Activité insecticide d’une souche marocaine de <i>Bacillus thuringiensis</i> sur la mouche méditerranéenne :<i> Ceratitis capitata (Wied.) (Diptera : Tephritidae)</i>

“…Dans tous les cas, les concentrations utilisées des endotoxines et des exotoxines de Bt A9 entraînent une diminution significative de l'émergence des adultes de C. capitata (Figure 3). Oliveira et al [20] ont démontré que l'effet des endotoxines sur l'émergence des adultes reste significativement élevé (de 26% à 76.7%) et variable d'une souche à l'autre. La diminution du pourcentage d'émergence des adultes observée en présence des endotoxines pourrait être due à la réaction des larves aux endotoxines avant l'entrée en pupaison.…”