Old thread but I use it. The phosphite fungicides generally will give you "suppression" for those diseases on the label that aren't oomycetes. I believe this is due to these products causing some Systemic Induced Resistance (SIR OR IRS) However, if used as a tank mix partner with say Prop or Eagle for foliar applications, disease control will be excellent and less active ingredient of the Triazole can be used. Some info available on the subject in a back issue of AUF.OK, Thanks for the feedback!
Why is phospho-jet labeled for scab: https://www.treestuff.com/store/catalog.asp?category_id=168&item=906
But agrifos is not: https://www.treestuff.com/store/catalog.asp?category_id=80&item=844
They are the same active ingredient just different application methods (trunk injections vs foliar spray or basal bark spray)