Jul 15, 2013 — The cloudy, rainy conditions last month were ideal for the spread of late blight spores. Late blight is a plant disease that attacks potatoes and tomatoes. It has not been confirmed in the North Country, but has been found on a tomato plant in Oneida County. Amy Ivy, horticulturist with Cornell Cooperative Extension in Clinton and Essex Counties, says tomato and potato growers in the region should take action. There's no cure for inflected plants, but there are ways to prevent its spread.