Crop Disease Rate per Acre
per 100 gal. of water

ppm’s (copper)
per 100 gal.of water


Onion, Garlic

Powdery Mildew

3.95 lb.2

19.2-25.6 oz.

7 days3

75-100 ppm

0.79 lb.1

Begin applications when disease symptoms first appear and repeat weekly intervals or as needed. Use the higher rates when conditions favor disease.

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**