Crop Disease Rate per Acre
per 100 gal. of water

ppm’s (copper)
per 100 gal.of water


Onion, Garlic

Bacterial Blight, Downy Mildew, Purple Blotch

2.12 lb.2

19.2 oz.

7 days3

75 ppm

1.0 lb.1

Begin when plants are 4 to 6 inches high and repeat at 7 to 10 day intervals or as needed depending on disease severity. Can cause phytotoxicity to leaves.

1Maximum per Application Rate (lbs Cu2+/A)
2Maximum Annual Rate (lbs Cu2+/A)
3Minimun Retreatment Rate (lbs Cu2+/A)
*Not Permitted in California
Permitted only in Washington State and Oregon**