NOVELTY - A botanical bactericidal agent comprises 0.1-30 wt.%, preferably 1-10 wt.% thymol, 6-15 wt.%, preferably 8-12 wt.% solvent, 1-3 wt.%, preferably 1-2 wt.% permeability agent, 1-3 wt.%, preferably 1-2 wt.% antifreeze agent, 0.3-1 wt.%, preferably 0.3-0.5 wt.% defoamer, 0.05-0.4 wt.%, preferably 0.1-0.3 wt.% stabilizer, 6-12 wt.% or 8-15 wt.% surfactant, 6-10 wt.% co-solvent, and balance water.    USE - Botanical bactericidal agent used for preventing and controlling rice blast, promoting rice growth, and improving immunity.    ADVANTAGE - The botanical bactericidal agent can increase production, is environment-friendly, and uses natural food additive.    DETAILED DESCRIPTION - A botanical bactericidal agent comprises 0.1-30 wt.%, preferably 1-10 wt.% thymol, 6-15 wt.%, preferably 8-12 wt.% solvent, 1-3 wt.%, preferably 1-2 wt.% permeability agent, 1-3 wt.%, preferably 1-2 wt.% antifreeze agent, 0.3-1 wt.%, preferably 0.3-0.5 wt.% defoamer, 0.05-0.4 wt.%, preferably 0.1-0.3 wt.% stabilizer, 6-12 wt.% or 8-15 wt.% surfactant, 6-10 wt.% co-solvent, and balance water. The solvent is ethanol or methanol. The permeability agent is organic silicone permeation agent including solution azone or permeability agent T. The permeability agent T is succinate sodium sulfonate or dioctyl sodium. The water-soluble nitrogen is 1-n-dodecyl azacyclohept-2-one. The antifreeze agent is glycerol, propylene glycol, or sorbitol. The defoaming agent is organic silicone defoaming agent, preferably polyoxyethylene polyoxypropylene glycerol (e.g. GPE10, GPE20, GPE30, GPE40, or GPE50), or alcohol. The alcohol comprises heptanol, octanol, isooctanol, nonanol, decanol, undecyl alcohol, or lauryl alcohol. The stabilizer is rosemary (plant extract) or xanthan gum. The epoxidized vegetable oil is epoxy soybean oil, epoxy castor oil, epoxy linseed oil, or epoxy cottonseed oil. The surfactant is biodegradable environmental polyoxyethylene ether (such as AEO-3 (RTM: fatty alcohol-polyoxyethylene ether)), phenethyl phenol polyoxyethylene ethers (such as: 601 dairy farming, 602 dairy farming, 603 dairy farming, and 604 dairy farming), phenethyl phenol formaldehyde resin polyoxyethylene ether (such as: Nongru 401, dairy farming No. 402, dairy farming No. 403, or dairy farming No. 404), castor oil polyoxyethylene ether (such as: EL-60 (RTM: castor oil polyoxyethylene ether)). The water is less than 342 mg/l of water hardness (in calcium carbonate) of water, such as tap water or deionized water.