Brevibacillus laterosporus strain compositions containing the same and method for the biological control of Dipters

The invention relates to a new bacterial strain belonging to the genus Brevibacillus laterosporus deposited with NCIMB N° 41419 in the NCIMB Ltd. Aber- deen, UK and to its derivatives obtained by mutation or genetic transformation or by growth in selective conditions. Products obtained by extraction, subcellular fractionation and/or lysis of cultures containing this bacterium are also considered Brevibacillus laterosporus derivatives. According to a primary aspect of the invention, this bacterium and its derivatives with insecticidal activity constitute the active principle of compositions and feeding baits used for biological control of Dipters. According to a further aspect, the invention relates to a method for biological control of insects belong- ing to the order Dipters characterized in that it uses the microorganism according to the invention or its derivatives and/or compositions according to the invention or feeding baits. The active principle has activity against Nematocers and Brachycerus (flies, mosquitos, horseflies and midges) and especially against the species Musca domestica.