Milk's natural enzymes ward off several types of mildews that commonly attack tomato plants. The use of milk also prevents aphid infestation and therefore keeps other insect-transferred diseases at bay. For best results, use a 50/50 dilution of milk and water and apply directly to foliage with a spray bottle once a week.
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Based in Ohio, Deborah Waltenburg has been writing online since 2004, focusing on personal finance, personal and commercial insurance, travel and tourism, home improvement and gardening. Her work has appeared on numerous blogs, industry websites and media websites, including "USA Today."