Since its first agronomical use in 1938, Bacillus thuringiensis (Berliner) (Bt) has been the major representative of microbes with a fruitful biocontrol application in agriculture. Its bioproducts – based on spores/entomotoxins – comprise ∼1.8% of today's world market of agrochemicals [1]. Despite the vast knowledge about mechanisms of insecticidal action and specificity of Bt, its largely unresolved ecology has been a matter of hot debate due to its occurrence in an astounding variety of niches.