GROWTH PROMOTER AND USE THEREOF IN PREVENTING AND TREATING CLUBROOT DISEASE IN CRUCIFEROUS CROP

Disclosed are a growth promoter and a use thereof in preventing and treating clubroot disease in cruciferous crops. The growth promoter comprises the following components in parts by weight: 0.3-0.5 parts of indolebutyric acid， 0.3-0.5 parts of naphthalene acetic acid， 15-20 parts of humic acid， 10-20 parts of boron， and 30-50 parts of a plant nutrient. The growth promoter employs suitable components in suitable proportions， which act in synergy to restore root absorption function. The growth promoter can be applied via a simple foliar spray and can rebuild the water and nutrient absorption functions of the root system of a clubroot disease infested plant and restore normal growth of a diseased plant on the verge of death， allowing the diseased plant to attain a survival rate of 90% or higher and an increase in yield of 60% or higher. In addition， the growth promoter is convenient and efficient， and overcomes the technical bottleneck in which plants infested with clubroot disease have low survival rates， and as a result the growth promoter can effectively decrease labor costs by 80% or more and at the same time reduce potential risks in food safety and environmental pollution associated with use of chemical fertilizers， offering significant social， economic and ecological benefits.