Crop Profile for Onions in Colorado - Regional IPM Centers

● Target Pests: Downy mildew, Purple blotch, Botrytis diseases, Smudge, Storage molds
● Recommended rate: 8.64 -25.92 fl oz ai/A (1.0-3.0 pt product/A)
● Use Data:
1992 = rate used- 1.17 lb ai/A
67% of total acres treated
1997 = rate used- 1.50 lb ai/A
50% of total acres treated
2001 = rate used- 1.50 lb ai/A
25% of total acres treated
● Usage for copper based products:
1992 = rate used- 0.53 lb ai/A
47% of total acres treated
1997 = rate used- 0.80 lb ai/A
75% of total acres treated
2001 = rate used- 0.80 lb ai/A
85% of total acres treated
● Comments: Includes all the following copper pesticides
Pesticide: copper hydroxide (Champion WP)
● Target Pests: Purple blotch, Downy mildew
● Recommended rate: 24.64 oz ai/A (2.0 lb product/A)
Pesticide: copper hydroxide (Champ Formula 2)
● Target Pests: Purple blotch, downy mildew. Bacterial soft rot, slippery and sour skin
● Recommended rate: 8.0 fl oz ai/A (1.33 pt product/A)
● Target Pests: Bacterial blight: 4.02-6.0 fl oz ai/A (0.67- 1.0 pt product/A)
Pesticide: copper hydroxide (Kocide 101 )
● Target Pests: Bacterial soft rot, Slippery and sour skin
● Recommended rate: 12.32-18.48 oz ai/A (1.0-1.5 lb product/A)
● Target Pests: Purple blotch, Downy mildew
● Recommended rate: 24.64 oz ai/A (2.0 lb product/A)
Pesticide: copper hydroxide (Kocide 2000)
● Target Pests: Bacterial soft rot, Slippery and sour skin
● Recommended rate: 12.91 oz ai/A (1.5 lb product/A)
Pesticide: copper hydroxide (4.5 LF)