Coffee leaf rust (Hemileia vastatrix) has decimated coffee regions around the world, and now it has reached Hawaii's Kona coffee region. If farmers find rust before it is on more than 5 percent of the coffee leaves on their farms, then it can be controlled by spraying preventative fungicides made with copper and bacillus, a bacteria found in soil. If the infected leaves are more than 5% infection, then the disease spreads quickly.
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