The present invention discloses a growth promoter and application thereof forprevention and treatment of club root disease of cruciferous crops. The growthpromoter comprises the following components in parts by weight: 0.3-0.5 partofindolebutyric acid, 0.3-0.5 part of naphthylacetic acid, 15-20 parts of humicacid,10-20 parts of boron and 30-50 parts of plant nutrient. The growth promoterforrestoring a root absorption function provided by the present invention adoptsappropriate components and proportions, the components cooperate with oneanother,and a simple foliar spraying method is adopted. On the one hand, it canrebuild thewater and nutrient absorption function of the root system of the club rootdiseasedplants, restore the normal growth of the diseased plants which are dying, makethesurvival rate of the diseased plants reach more than 90%, and increase theyield bymore than 60%. On the other hand, the promoter is convenient and quick to use,overcomes the technical bottleneck that the club root diseased plants aredifficult tosurvive, can effectively decrease labor cost by more than 80%, cansimultaneouslydecrease the potential risks of food safety and environmental pollution causedby theuse of chemical pesticides, and has remarkable social, economic and ecologicalbenefits.
