Under ideal conditions, Phytophthora blight is an aggressive, fast moving disease that can cause extensive losses. This disease has become increasingly problematic on cucurbits and solanaceous crops in the United States. During the past decade, Phytophthora blight has been causing significant losses in several major vegetable production areas of the U.S. In Kentucky, serious outbreaks have been reported on summer squash, winter squash, cucumbers, watermelons, and peppers.