Application of fructus chebulae extract in preparation of saprolegnia dogwood inhibitor

The invention relates to application of a medicine terminalia fruit extract in preparation of a saprolegnia dogwood inhibitor. Researches show that the inhibition rate of saprolegnia hyphae after the myrobalan extract is diluted by 4 times at the position 0.5 cm away from a saprolegnia agar block can reach 100%, the inhibition rate of the saprolegnia hyphae after the myrobalan extract is diluted by 16 times still reaches 60%, and the inhibition rate of the saprolegnia hyphae after the myrobalan extract is diluted by 4 times at the position 2 cm away from a drug sensitive paper still reaches 50%; and even if the citronella extract with the same medicinal material amount in the same period is not diluted and the distance is only 0.5 cm, the growth inhibition rate of the saprolegnia dothidea hyphae does not exceed 50%, and the inhibition rate is greatly reduced after the citronella extract is diluted. Obviously, the fructus chebulae extract has a very good inhibiting and killing effect on bacteria such as aeromo