The invention refers to formulae for biologic control of insect plagues in plants, free of chemicals, that include deposited Bacillus thuringiensis var. kurstaki strains, as well as crystals from endotoxins derived from said strains. It also refers to the biologic control method for the protection of plants from insect plagues through the application of the said formula on plants, their parts, the soil, or their surroundings.
