Soil fumigation is practical solution - both as a cure and prevention for germinating weed seeds. Nematodes Fungal diseases (including Rhizoctonia. Pythium. Phytophthora. Verticillium and Fusarlum) Soil fumigation can be carried out in Green. Houses. Nursery seed beds. Lawns. Ornamental Plants. Food and fibre crops. Tobacco and control of certain weeds including onion weed (WA only). By doing soil fumigation, the plants will have better growth and also better yield.