Abstract:

Abstract: Harpins are proteins produced by plant pathogenic bacteria; They induce hypersensitive response in non-host plants. The the induce-resistance effect of Harpin was investigated in cucumber. The results show that the 3% HarpinEa 10g-30g + water 30kg / 667 ㎡Were applied 3 times 20 days interval after the cucumber transplanting. The effect of induced resistance on cucumber downy mildew and Botrytis cinerea were respectively up to 58.90% and 44.22%. The effect of different concentrations of HarpinEa had no significant difference. If the occurrence of these two diseases were serious，3% HarpinEa 20g + water 30kg / 667 ㎡combined with the corresponding aerosol released had a better effect and the effect was up to 80.26%.