strains isolated from Qatari soil, synthesizing δ-endotoxins highly active against the disease vector insect .

is a Gram-positive soil bacterium that has been recognized as an effective bioinsecticide active against plant, animal and human pathogenic and disease vector insects. During its sporulation phase, produces crystals consisting of δ-endotoxins, which upon ingestion kill specifically insect larvae. subsp. () is very active against dipteran insects. based bioinsecticides are considered as a sustainable solution to control the Dipteran insects responsible of plant, animal and human diseases. In this study, strains isolated from Qatar soil were analyzed for their insecticidal activities against the dipteran insect () and for their δ-endotoxins yields per cell. Among the local strains, four exceptional strains producing spherical crystals, were found to be more insecticidal than the reference strain H14. When tested for their δ-endotoxin yield, the QBT217 strain, producing typical spherical crystals and having the best insecticidal activity, was recognized as the best candidate strain for potential bioinsecticide production and biological control of dipteran insects, particularly the disease vector insect .