A phosphite in inorganic chemistry is a salt of phosphorous acid, H3PO3.

Phosphite salts can be used as a biodegradable fungicide to protect turfgrass and sports fields against Pythium root rot,  pathogens of the order Oomycetes, and Phytophthora.

Phosphite treatments works by boosting the turf grasses own natural defenses and thereby allowing susceptible plants to survive infections.  Phosphorus deficient turfgrass will be more susceptible to certain diseases than phosphorus-sufficient plants.  

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