Potato late blight already has been identified in a few tuber samples, which were stored form the 2009 growing season and sent in by Wisconsin homeowners this spring.

The late blight in the stored tubers serves as an inoculum source for this year's crop.

Additional sources may be present as a result of the 2009 epidemic, and they may include volunteers, cull piles, seed and mismanaged compost piles.

To read the full article, click here to download the University of Wisconsin's Vegetable Crop Update and scroll midway down the newsletter.