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Common pythium species in greenhouse crops

Pythium is a large class of water molds, several of which are plant pathogens. They can infect plant roots, causing root disease and crown rot in plants or damping-off of seedlings. As water molds, they prefer wet growing media and commonly attack plants that are stressed from overwatering.

One of the best ways to prevent Pythium from attacking is to allow crops to dry out between irrigations and to minimize plant stress.

Plant disease clinics have identified over 120 species of Pythium that have infected plants. According to Gary Moorman (Professor Emeritus of Pathology, Penn State University) and Margery Daughtrey (Senior Extension Associate, Department of Plant Pathology, Cornell University), the three most common Pythium species that cause disease in greenhouse crops are:

Pythium aphanidermatum
Pythium ultimum
Pythium irregulare

Knowing which species of Pythium is infecting a crop can make a difference when it comes to disease control strategies.

Read more at PRO-MIX