Sanchis V. auteur aut IRD Bourguet Denis auteur aut IRD text journalArticle eng text/pdf born digital access Bacillus thuringiensis (Bt) is a sporulating, Gram-positive facultative-aerobic soil bacterium. Its principal characteristic is the synthesis, during sporulation, of a crystalline inclusion containing proteins known as delta-endotoxins or Cry proteins. These proteins have insecticidal properties. The considerable diversity of these toxins, their efficacy and their relatively cheap production have made Bt the most widely used biopesticide in the world. It is used in the fight against many agricultural crop pests - mostly lepidopteran and coleopteran larvae - notably in the creation of new plant varieties expressing Bt cry genes. For human health, Bt can be used for the effective control of populations of several dipteran disease vectors. The aim of this review is to provide an overview of the use of Bt for crop protection and to deal with the problem of the emergence of insects resistant to this biopesticide. We will begin by presenting various aspects of the biology of this entomopathogenic micro-organism, focusing on the diversity and mode of action of the insecticidal toxins it produces. We will then present several examples of utilization of commercially available Bt products used as sprays or as transgenic crops. Finally, we will describe the principal strategy for the use of Bt transgenic plants, developed so as to prevent or delay the emergence of resistance in target insect populations. specialized Bacillus thuringiensis biopesticide delta endotoxin transgenic plants resistance management Cry protein 076 28 1 11-20 2008 1774-0746 https://www.documentation.ird.fr/hor/fdi:010042522 10.1051/agro:2007054 1774-0746 [F B010042522] https://www.documentation.ird.fr/hor/fdi:010042522 https://www.documentation.ird.fr/intranet/publi/2008/04/010042522.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2008-05-06 2017-08-23 fdi:010042522 fre