Preparation method of extracting solution with antibacterial activity on phytophthora infestans

The invention relates to a preparation method of an extracting solution with antibacterial activity on phytophthora infestans. The culture medium mushroom bran obtained after mushroom picking is used as a main raw material, waste is recycled, and the mushroom bran water extracting solution is obtained through drying, smashing, water adding and high-temperature treatment. The mushroom bran water extracting solution is directly added into the rye culture medium for culturing the potato phytophthora infestans, the production steps are simple, the application range of the mushroom bran is widened, and a new thought is provided for preventing and treating the potato phytophthora infestans original bacteria. The result shows that the mushroom bran extracting solution can significantly inhibit the growth of the potato phytophthora infestans, when the concentration of the extracting solution is 6.25%, the bacteriostasis rate is close to 100%, and the inhibition effect in the early culture stage is stronger. A scannin