Maximum control with minimum environmental impact. OMRI Listed copper fungicide/bactericide designed for superior control, minimal copper load, excellent storage and mixing, without the staining.

Mastercop Video

Crop protection

  • BioRetainTM - Allows penetration into plant cuticle for improved performance per pound of AI.

  • High copper bioavailability results in increased adhesion, cuticle penetration and rainfastness, which increases efficacy with minimal phytotoxicity.

  • Instant release of copper ions for faster activity on pathogens present on the leaves.

  • Less metallic copper applied, reducing soil loading, this fits well with EPA’s anticipated reduced metallic copper rates per acre.

  • Easy-to-handle true liquid solution no settling, no clogging, no nozzle wear.

  • No blue residue so your crop is left clean.


Field Crops

  • Alfalfa*
  • Corn (Field Corn, Popcorn, Sweet Corn)*
  • Peanut*
  • Potato*
  • Sugar Beet*
  • Wheat*, Barley*, Oats*

*Not for use in California.


  • Grapefruit
  • Kumquat
  • Lemon
  • Lime
  • Oranges
  • Pummelo
  • Tangelo
  • Tangerine

*Not for use in California.

Small Fruits

  • Blackberry (Aurora, Boysen, Cascade, Chehalem, Logan, Marion, Santiam, Thornless Evergreen)
  • Blueberries
  • Cranberry*
  • Currant*, Gooseberry*
  • Raspberry
  • Strawberry

*Not for use in California.

Tree Fruits and Tree Nuts

  • Almonds
  • Apricots
  • Cherry
  • Plum
  • Prune
  • Apple
  • Avocado
  • Banana*
  • Cacao*
  • Coffee*
  • Filbert*
  • Mango*
  • Olives
  • Peach, Nectarine
  • Pear
  • Pecan*
  • Pistachio
  • Quince*
  • Walnuts

*Not for use in California.


  • Bean* (Dry, Green)
  • Beet* (Table Beet, Beet Greens)
  • Carrot
  • Celery, Celeriac
  • Crucifers (Broccoli, Brussels Sprouts, Cabbage, Cauliflower, Collard Greens, Mustard Greens, Turnip Greens)
  • Cucurbits (Cantaloupe, Cucumber, Honeydew, Muskmelon, Pumpkin, Squash, Watermelon)
  • Eggplant
  • Okra*
  • Onion, Garlic
  • Pea
  • Pepper
  • Spinach
  • Tomato
  • Watercress*

*Not for use in California.


  • Grapes
  • Hops*
  • Kiwi*

*Not for use in California.


  • Atemoya*
  • Carambola*
  • Chives
  • Dill
  • Ginseng
  • Guava*
  • Litchi*
  • Macadamia*
  • Mamey* Sapote*
  • Papaya*
  • Parsley
  • Passion Fruit*
  • Sugar Apple* (Annona)
  • Sycamore*

*Not for use in California.

To view label and full product information click here.


Now OMRI Listed®!

Key Targets

Anthracnose, Bacterial Blast, Brown Rot Blossom Blight, Brown Spot, Cercospora Leaf Spot, Downy Mildew, Early and Late Blight, Gray Mold, Leaf Spot, Phomopsis, Powdery Mildew, Rusts, Scab, Stem Blight

Group Number


Package Sizes

2x2.5 gal

Active Ingredient

Copper Sulfate Pentahydrate