The present invention provides a package (200) comprising at least one first component in the form a well (220), the first component comprising particulate matter comprising at least one natural oil； at least one second component, in the form of a plurality of second wells (230) comprising antagonist(s) of a microbial pathogen； wherein the at least one first component and the at least one second component are contained in separate compartments of said package. Also provided by the present invention is a method for providing an anti-bacterial agent, the method comprising mixing the first component comprising particulate matter carrying at least one natural oil； and at least one second component comprising at least one antagonist of a microbial pathogen, and allowing said mixture to form into an emulsion with anti-bacterial activity. Further provided by the present invention is a method of treating or preventing a pathogen infection in a plant, the method comprises applying to said plant an amount of an emulsion comprising particulate matter, at least one natural oil and at least one antagonist of a microbial pathogen that causes said pathogen infection. Yet further, there are provided some isolated antagonistic bacteria that may be used, inter alia, in the package and methods disclosed herein.
