Dwayne,
Nova is listed for use on grapes up to 14 days before harvest. That's the max time between applications too, so it probably doesn't persist for more than a couple of weeks. Besides, once veraison occurs, Black Rot is unlikely to be much of a problem. For this reason, my last spray of "Nova" is usually about 4-6 weeks pre harvest.
Mike MTM, Cokesbury, New Jersey, USA
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