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Onion Pesticide Summary  DRY BULB ONION PLANT DISEASE - Foliar Pesticide Options in Colorado

Pesticide PHI bacterial Complex Downy Mildew Purple Blotch Botrytis (Neck rot/blast)  Actigard (Acibenzolar)  7  Xanth  Iris yellow spot virus Section 18 until 9/01/06 Acrobat (Dimethomorph) 1 NO YES NO NO Agri-Fos (Phosphorous Acid) 1 NO YES NO NO Aliette (Fosetyl-A) 7 NO YES NO NO Cabrio (Pyraclostrobin) 7 NO YES YES NO Chlorothalonil1 7 NO Suppression YES YES Copper-based Bactericides2 1 YES Suppression Suppression NO EBDCs3 7 NO YES YES YES Endura (Boscalid) 7 NO NO YES YES Forum (Dimethomorph) 1 NO YES NO NO Iprodione4 7 NO NO YES YES Pristine (Cabrio + Endura) 7 NO Suppression YES YES Quadris (Azoxystrobin) 1 NO Suppression YES NO Ridomil Mix (Metalaxyl)5 7 YES (+ copper) YES (+ EBDC or Bravo) YES (+ EBDC or Bravo) YES (+ EBDC or Bravo) Switch (Cyprodinil) 7 NO NO YES YES

NOTE: Always consult a current pesticide label before use. 1 includes products such as Bravo, Ensign 2 includes products such as Champ, Cuprofix, Kocide, Nu Cop, ManKocide; tank (pre) mixes with EBDCs enhance activity 3 includes products such as Dithane, Maneb, Manex, Mancozeb, Manzate, Penncozeb 4 includes products such as Generic, Rovral 5 includes products such as Ridomil + Copper or Bravo or Mancozeb as a tank-mix [ Prepared by Dr. H. F. Schwartz & M.S. McMillan, Colorado State University, 07/06 ]

Updated pesticide information is available at www.highplainsipm.org