bacillus lentimorbus bacillus lentimorbus bacillus lentimorbus is a gram-positive bacterium used as a soil or plant inoculant in agriculture and horticulture. it is the causative agent of milky disease in some scarab beetle larvae. bacillus lentimorbus scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: bacillus species: b. lentimorbus binomial name bacillus lentimorbusdutky 1940 (approved lists 1980)