 The relatively small genome size of "Phytophthora parasitica" compared to "Phytophthora infestans" gives researchers the unique ability to further examine its ability to cause disease.Buckeye rot of tomato affects tomato plants, although there are many other plants that are affected, including pepper, potato, tobacco, pineapple, and various other hosts.Upon infection, brown and greyish-green water-soaked spots appear on the fruit.