Phosphites

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

Phosphite salts can be used as a biodegradable fungicide to protect golf course turfgrass against Pythium root rot and other  pathogens of the order Oomycetes.  It’s primarily used on greens and fairways as a preventative treatment.

Phosphite treatments works by boosting the turf grasses own natural defenses and thereby allowing susceptible plants to survive infections.   Most turfgrass fungicides are either contacts or translocated in plant xylem,  however the phosphonate fungicides possess movement in both xylem and phloem. Translocation in phloem allows the fungicide to move from leaf tissues to the crowns and roots. Because of this unique property, phosphonates are viewed as excellent fungicides for controlling root rot diseases such as Pythium root rot and dysfunction caused by various Pythium  species.

 

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