You say phosphite, I say phosphate...does it matter?

Yes, it most certainly does matter. Products based on phosphite (also known as phosphonate or phosphorus acid) have been shown to have moderate to excellent activity against diseases such as Pythium, anthracnose and algae. But a flood of new products on the market (see Table 1 below), and some confusing nomenclature (naming conventions) have raised several questions, including:

Is there a difference between phosphates and phosphites? Absolutely yes! While phosphite products have shown good activity against Pythium, anthracnose and algae,…