Reagent composition for treating fruit tree rot disease and preparation method thereof

The invention belongs to the technical field of prevention and control of fruit tree diseases and insect pests and particularly relates to a reagent composition for treating a fruit tree rot disease and a preparation method thereof. The reagent composition is mainly prepared from 75-80% of waste engine oil, 10-15% of asphalt and 8-11% of bactericide with the concentration of 98%, wherein raw materials of the reagent composition also include compound sodium nitrophenolate, the mass of the compound sodium nitrophenolate accounts for 0.3%-0.5% of the total formula mass. Due to the waste engine oil has good permeability, the bactericide can be carried to penetrate into tree bodies, the asphalt and the waste engine oil can play the effect of a protective film, the reagent composition is resistant to rain wash and can always keep the medicinal properties of reagents, the compound sodium nitrophenolate can promote plant growth and wound healing, and the waste engine oil is used as a raw material, so that waste is re