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The image shows TMV infected plants from workers who intentionally contaminated their hands with the virus prior to transplanting tobacco seedlings (left) and plants that were transplanted after the worker's TMV-contaminated hands were 'washed' in milk (right). The tobacco cultivar is Clemson PD-4. Hand washing with milk or soap and water reduced the incidence of TMV by 95 and 100%, respectively. A comprehensive program of hand washes, sanitation, rotation, rogueing infected plants, and use of resistance varieties is suggested to control TMV in tobacco.
Photograph courtesy J. P. Krausz.
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