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Onion Pesticide Summary

 DRY BULB ONION PLANT DISEASE - Foliar Pesticide Options in Colorado

Pesticide

PHI

Bacterial/Viral Complex

Downy Mildew

Purple Blotch

Botrytis
(Neck rot/blast)
Actigard (Acibenzolar) 7  Xanth/IYSV Suppression NO NO
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
Folicur (Tebuconazole) 7 NO NO YES NO
Fontelis (Penthiopyrad) 3 NO

NO

YES

YES
Forum (Dimethomorph) 1 NO YES NO NO
Iprodione4(Dicarboximide) 7 NO NO YES YES
Pristine (Cabrio + Endura) 7 NO Suppression YES YES
Quadris (Azoxystrobin) 1 NO Suppression YES NO
Quilt (Propiconazole + Azoxystrobin) 14 NO NO YES Suppression
Reason (Fenamidone) 7 NO YES YES NO
Revus (Mandipropamid) 7 NO YES NO NO
Ridomil Mix (Metalaxyl)5 7 YES
(+ copper)
YES
(+ EBDC or Bravo)
YES
(+ EBDC or Bravo)
YES
(+ EBDC or Bravo)
Scala (Pyrimethanil) 7 NO NO YES YES
Switch (Cyprodinil) 7 NO NO YES YES
Tanos (Famoxadone + Cymoxanil) 3 NO YES YES NO
Tilt / Propimax (Propiconazole) 14 NO NO YES Suppression
Vanguard (Cyprodinil) 14 NO NO YES Suppression

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 may 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, 4/2012 ]

Updated pesticide information is available at: wiki.bugwood.org/HPIPM:Onion