Neem Oil Water Soluble Care for your plants with Neem Oil Water Soluble Terra neem oil water soluble is emulsified concentrated product so it is ready to use just mixed with the water. As a preventative neem oil water soluble can be used when the pest problems are just starting to show. By spraying the neem oil water soluble it will cost the leaf surface which in turn prevents the germination of the fungal spores. Neem is effective against rots, mildwes, rusts, scab, leafspot and blights. It makes a great graden spray as a general tonic for your plants and soil.