Horticultural oil is an effective and ecologically friendly way to handle many garden insect pests and even some diseases. Most hort oils are some type of mineral oil, a refined petroleum product. The oil is usually combined with some type of emulsifying agent so that it can be mixed with water and used as a spray. You may see it listed as dormant, summer, all-season or even superior oil. Heres what the difference is.
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[Source: About.com Gardening: Most Popular Articles]
