?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Could+phosphite+be+a+new+fungicide+for+organic+farming%3F+&rft.creator=Speiser%2C+Bernhard&rft.creator=Tamm%2C+Lucius&rft.subject=Crop+health%2C+quality%2C+protection&rft.subject=Viticulture&rft.description=Quote+from+the+article%0D%0A%0D%0A%22Potassium+phosphite%2C+also+called+%C3%82%C2%ABphosphonate%C3%82%C2%BB%2C+is+a+salt+of+phosphonic+acid+with+the+formula+K2HPO3.%0D%0A%0D%0AIt+should+not+be+confounded+with+phosphates%2C+nor+with+the+organophosphorous+insecticides+which+are+also+called+%C3%82%C2%ABphosphonates%C3%82%C2%BB.+Potassium+phosphite+can+be+used+as+a+fungicide+against+oomycetes+in+various+crops.+In+the+early+1990ies%2C+it+was+extensively+tested+on+organically+grown+grapevines+in+Switzerland.+It+was+effective+against+downy+mildew+(Plasmopara+viticola)%2C+and+blocked+the+disease+up+to+3+days+after+infection.+Phosphite+was+mobile+and+very+persistent+in+plants+and+could+be+detected+in+grapes+harvested+one+year+after+the+last+application.+Analyses+of+53+wine+samples+reveiled+that+the+treatment+inevitably+leads+to+phosphite+residues+in+wine%2C+usually+ranging+between+5000+%C3%A2%C2%80%C2%93+10000+ppb+phosphite.+Phosphite+residues+were+also+found+in+other+crops+(e.g.+potato%2C+celery)+treated+with+potassium+phosphonate.%0D%0A%0D%0AFrom+a+toxicological+point+of+view%2C+these+residues+are+of+no+concern.+However%2C+consumers+of+organic+wine+expect+to+buy+a+%C3%82%C2%ABnatural%C3%82%C2%BB+product%2C+and+we+assume+that+they+would+not+approve+the+presence+of+such+quantities+of+fungicide+residues+in+organic+wine.%0D%0A%0D%0ACurrently%2C+potassium+phosphonate+is+not+authorized+as+a+fungicide+for+organic+farming+in+the+EU%2C+and+we+do+not+recommend+its+use+in+the+future%C3%A2%C2%80%C2%9D.&rft.date=2007&rft.type=Journal+paper&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Forgprints.org%2F12817%2F1%2Fspeiser-tamm-2007-phosphite.pdf&rft.identifier=Speiser%2C+Bernhard+and+Tamm%2C+Lucius+(2007)+Could+phosphite+be+a+new+fungicide+for+organic+farming%3F+New+Ag+International%2C+Sept.+2007%2C+p.+26.&rft.relation=http%3A%2F%2Forgprints.org%2F12817%2F