The invention provides a package (220) with at least one first component in one well1. The first component composing specific matter composing at least one natural oil； at least one second component, in the form of a plurality of second wells (() compositing antagonist () of a microbial pathway； When at least one first component and at least one second component are included in the separation comparison of the package. The invention also provides a method for providing an antimicrobial agent, the method comprising mixing a particulate matter of the first component, operating in at least one natural oil, and a second component in at least one microbial pathogen antagonist.And the alloy said the mixture would form an emulsion with antibacterial activity. The invention also provides a method for treating or preventing infection of plant pathogens, including plants applied in emulsion decomposition particles of at least one natural oil and at least one microbial pathogen antagonist. In addition, some isolated antagonistic bacteria are provided in the package and method, which can be used between aliases.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 invent
