Vermicompost tea (VCT) applications at the rate of 5ml/pot three or four times with irrigation water gave the best reduction of onion white rot with 30.0% infection, while the fungicide Folicure gave 10.0% infection compared with 70.0% infection at non-treated plants. In field experiments all tested treatments reduced the percentage of infection compared with non-treated plants. The best treatment in reducing onion white rot was VCT at the rate of 15 L/fed four times with irrigation water that gave 20.0% infection, while the fungicide Folicure gave 8.3% infection. On other hand, VCT treatment at the rate of 15L/fed four times with irrigation water increased onion yield, plant height, no. of leaves/plant, onion fresh and dry weight more than all other treatments even Folicure treatment. Also, all VCT treatments increased total count of soil bacteria, fungi and actinomycetes Compered with control.