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streptomycin in larger packages intended to treat large areas.
Most brands include the word strep, or mycin in their trade name. Instructions on these packages often talk about mixing solutions in parts per million to treat an entire acre. These products are mixed at a rate of one teaspoon per gallon for smaller applications.
If trees are not treated for fire blight this spring, and the disease does show up in May or June, pruning out the affected tissue is the only strategy recommended. The use of streptomycin after symptoms appear is highly discouraged. It will not control the disease, and may help the bacteria develop resistance to the product.
The full homeowners spray guide for fruit trees is available on the Internet at http://www.ext.vt.edu/pubs/p mg. From the home page, select Home Grounds and Animals, and then Home Fruit. There are 36 pages with information on diseases and insects, as well as spray schedules for tree fruits and small fruits.
Virginia Cooperative Extension programs are open to all, regardless of race, color, religion, sex, age, veteran status, national origin, disability or political affiliation.
Chuck Hoysa is the Extension Agent, Horticulture for PD 9, and is located at 24 Pelham Street in Warrenton. You may reach Chuck at crhoysa@vt. edu.
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