Onion Pesticide Summary

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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