Grapefruit and citrus fruits often fungal infection in leaves and fruits, such as scabies, anthracnose, rust, melasma, tan. Fungal diseases make greatly influence in the productivity, quality and colors of grapefruit, especially is Dien grapefruit. Organic fungicides currently are restricted use due to have high toxicity and pollute the environment. Nano-products with high anti fungal effect, non-toxic and non-polluting environment are being interested. This paper presents the results of research on preparation and testing of anti fungal for Dien grapefruit from nano compounds. The preparations is dispensed with the ratio of substances: 500 mg/liter of nano silver, 10,000mg/liter of nano copper oxichloride, 50g/liter of polyvinylpyrrolidone, 15g/liter of nonyl phenol ethoxylate and 15g/liter of trietanolamine. Validity of anti Rust fungi, anti Anthracnose fungi and anti Scabies of the product reaches 71.5%, anti tanned grapefruit reaches 80.6% at the concentration is 100ml/10 liters of water. At the concentration of 150ml/10 liters of water, the validity of anti fungal reaches 79.3%, anti tanned reaches 85.1%. And at the concentration of 200ml/10 liters of water, the preparations for validity of anti fungal reaches 83.7%, anti tanned reaches 90.3%.

Keyword: Products, anti fungal, anti tanned, nano SILVER, nano copper oxychloride, polyvinylpyrrolidone.