Pythium is commonly referred to as “root rot” by most cannabis cultivators. This stealthy pathogen is a fungus with a nasty habit of wreaking havoc on root zones in hydroponic systems and any other damp medium it manages to infest. Pythium root rot causes poor growth as a result of rotten roots. Thus the disease is challenging to manage through crop rotation. (This particular sample did have some Pythium as well, I just had a hard time getting a clear photo). While Pythium root rot is caused by several different species of Pythium with different temperature optima – cool to hot, Phytophthora blight is only favored by hot weather. Pythium is one of most the common causes of seed rot, damping-off and root rot in hydroponics. Pythium ultimum and Pythium irregulare can infect alfalfa seeds, causing seed blight or rot (pre-emergence damping off), or they can cause water soaking and eventual death of the roots and stems of seedlings as they emerge (post-emergence damping off). In addition, these conditions can trigger Pythium root rot. Back. Tuesday, September 29, 2020 | Troy Buechel PDF version of this text: Featured Root Rot Pathogen: Pythium Of all the root rot pathogens, Pythium is the most common problem that growers experience.Pythium consists of approximately 125 different species, not all of which are plant pathogens, and is found in almost every environment. The environmental stress alone can cause major root decline and turf damage. Heavy rains early in the planting season favor both Pythium root rot and Phytophthora blight. And, these stress conditions can also lead to crown anthracnose. Featured Root Rot Pathogen: Pythium. Periods of hot, rainy weather following a cool wet spring can be a predictor of future problems with these diseases. Rotation is recommended used routinely beginning before crown and root rot is a problem. 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