The present invention provides an underwater injecting agent capable of effectively controlling pathogens and / or pests in trees in a short amount of time by a small amount of work, and a method of preventing a tree blight using an underwater injecting agent. In one aspect of the present invention, an insoluble sterilizing component such as thiophanate methyl is added to an aqueous solution of an insecticidal component such as acetamiprid, and the insoluble sterilizing component is suspended in a size of 50% Or at least one sterilizing component selected from the group consisting of triflumizole and metconazole is added to obtain an aqueous injecting agent.
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