INDUSTRIAL APPLICABILITY According to the present invention, there are provided a tree trunk injecting agent that can effectively control pathogenic bacteria and / or pests in a tree even with a low drug amount in a short time, and a tree disease preventing method using the tree injecting agent. In one embodiment of the present invention, a sparingly disinfecting component such as thiophanate methyl is added to an aqueous solution of an insecticidal component such as acetamiprid, and the sparingly disinfecting disinfecting component is suspended in a volume-based 50% particle size of 4 μm or less, or At least one bactericidal component selected from the group consisting of triflumizole and metconazole is added to obtain a trunk injection agent.
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