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.