Phytophthora parasitica and Pythium aphanidermatum are fungi that also incite root or stem rots. Phytophthora root and stem rot is characterized by necrotic stem lesions with faded reddish borders, grey-green discoloration of the stems, and segment abscission. Pythium root and stem rot is similar to the former disease, except that segment abscission is rare. Banrot (40WP and 8G) is registered for contol of Phytophthora and Pythium on holiday cactus.