▎ 摘　　要

NOVELTY - Bacteriostatic agent containing chestnut extract comprises the extract waste, the extract waste is one of chestnut flower and chestnut bud as raw material, and the volume concentration is 40-70 % ethanol solution to extract. USE - Bacteriostatic agent containing chestnut extract used for the treatment of plant disease caused by plant pathogenic bacteria (claimed). ADVANTAGE - The bacteriostatic agent has a good inhibitory effect on plant-derived fungi, the bacteriostatic agent is not easy to cause the bacteria to develop drug resistance, and not causing damage to the ecological environment, food hygiene and public safety. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for preparing of bacteriostatic agent containing chestnut extract which involves: (a) firstly adding water and the graphene occupying 85-95 % of the total mass of the water in the dosing kettle, mixing them uniformly; (b) then adding the anti-foaming agent, stirring uniformly, mixing 65-75 % of the total mass of the anti-foaming agent, then adding the wetting dispersant, stirring and mixing uniformly; (c) then adding the chestnut waste extract the magnesium aluminium silicate and the glycol into the mixing kettle, after finishing adding, stirring and cutting, stirring and cutting for 20-30 minutes, after finishing cutting to obtain the first-stage slurry; (d) performing sand grinding to the first-stage slurry to obtain secondary slurry with particle diameter of 3 ≤ µm D90 ≤ 5 µm; and (e) in the preparing kettle, adding the rest water and the rest of the anti-foaming agent, mixing uniformly to the secondary slurry; and (2) a treatment method for plant disease caused by plant pathogenic bacteria, which involves spraying on disease plant, the bacteriostatic agent containing chestnut extract or bacteriostatic agent containing chestnut extract prepared by the preparation method.