The present invention relates to the field of
protein nanofibrils originating from
Bacillus sp. provided in a composition as additive to a biologically active substance, in particular to a microbial substance such as a
pesticide or
plant beneficial agent. More specifically, the present invention relates to a composition comprising an agriculturally
bioactive substance and Alpha(
helical)
Endospore appendage (A-ENA)
protein nanofibril materials, more precisely wherein said A-ENA
protein nanofibrils are recombinantly produced and exogenously added to said
bioactive substance of the composition, thereby functioning as coformulant or additive, and preferably increasing the
biological activity of said substance. In particular, the composition of the invention comprises B. thuringiensis spores or cells and self-assembled (engineered or functionalized) A-ENA protein nanofibrils as coformulant, providing for an improved
efficacy and / or application potential as
pesticide or insecticide. The present invention further relates to a method for controlling
plant growth and protection of plants or parts thereof from pest damage, in particular by applying said composition of the invention in an effective amount or formulation, wherein the presence of said A-ENA protein nanofibril coformulant or additive results in increased
efficacy and / or
virulence of the
bioactive substance of said composition, in particular for bioactive substances comprising
Bacillus sp. strains.