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In order to protect roses without using chemicals, the first step is to pick out leaves that are bad by hand, but neem oil can also be sprayed on roses as an organic solution. Find out how fungus and black spot infections can spread between leaves on a rose with help from an urban horticulturist and gardening adviser in this free video on growing roses. Expert: Stan DeFreitas Contact: AskMrGreenThumb.com Bio: Stan DeFreitas, also known as "Mr. Green Thumb", has experience as an urban horticulturist working for the Pinellas County Extension Service, and has taught horticulture at St. Petersburg College. Filmmaker: Christopher Rokosz