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Monterey Liquid Copper Fungicide RTU
Monterey Liquid Copper Fungicide RTU delivers effortless preventative fungal control with its ready-to-spray solution on flowers, fruits, and vegetables.
04/24/26
Monterey Liquid Copper Fungicide RTU, manufactured by Monterey, is an easy-to-use preventative fungicide that ensures better blooming and yield of many vegetables, fruits, and ornamentals by stopping diseases before they spread and contains some curative control on minor outbreaks.
When time constraints or other physical limits make it difficult to apply traditional fungicides, this preventive fungicide comes pre-mixed, helping to eliminate these constraints and take the guesswork out of the application. This specially made product contains copper 0.08%, a natural element that controls and prevents powderey mildew, fruit rot, and more.
Monterey Liquid Copper Fungicide RTU is an OMRI ready-to-spray fungicide that prevents the spread of fungal spores, reducing the risk of infection of healthy plants during their active season of growth and their dormant season.
Tools Needed
No tools are needed as it comes ready to use.
How to Use
- Step 1: Determine how much Monterey Liquid Copper Fungicide RTU to use by measuring the square footage of the treatment area. To do this, measure the length and width of the treatment area in feet, then multiply them together (length X width = square footage). One quart of Monterey Liquid Copper Fungicide RTU will treat 10 square yards.
- Step 2: Spray all plant parts thoroughly, including the top and bottom of leaves.
Where to Use
Listed flowers, fruits, and vegetables in homes, home gardens, and home greenhouses may be treated with this product.
When to Use
Begin treatment 2 weeks before the disease appears typically or when the disease first appears, and repeat at 7 to 10-day intervals for as long as needed. Re-apply after rain.
For a dormant spray, apply during a period of dry weather in the late fall.
Safety Information
Monterey Liquid Copper Fungicide RTU is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when applying this product.
Special Considerations
Monterey Liquid Copper Fungicide RTU may cause some copper toxicity on some plant species. Copper toxicity appears as purple spots.
| Restricted Use | No |
|---|---|
| Shipping Restrictions | AR, DC, ND, SC, WV, WY |
| Availability | Online |
| Signal Word | CAUTION |
| Keith's Pro Tip | "During the plants period of active growth, prune away discolored leaves, flowers, and remove any damaged fruits to help your plant better survive disease activities." |
| Time to Kill | Monterey Liquid Copper Fungicide RTU will begin working to protect plants and cure some disease outbreak within 7-10 days. |
| Chemical Type | Fungicide |
| Formulation | Ready-To-Use |
| Application Methods | Spot Treatment |
| Product Drawbacks | Monterey Liquid Copper Fungicide RTU will not control major disease outbreak and works mainly as a protectant. |
| Active Ingredient | Copper Octanoate (Copper Soap) 0.08% |
| Application Equipment | Gloves |
| Mix Rate | Apply 1 quart of Monterey Liquid Copper Fungicide RTU to treat 10 square yards. |
| Use Sites | Indoors, Outdoors |
| Yield | One quart of Monterey Liquid Copper Fungicide RTU will treat 10 square yards. |
| EPA Registration No. | 67702-1-54705 |
| Shelf Life | Monterey Liquid Copper Fungicide RTU will last for 3 years when stored in a cool, dry area that has temperatures above 40 degrees Fahrenheit. |
| Comparable Products | Natural Guard Copper Soap Fungicide RTU |
| Children or pets? | No |
| Property Characteristics | None |
| Availability | Online |
| Restricted Use | No |
| Brand | MONTEREY |
| Keith's Pro Tips | "During the plants period of active growth, prune away discolored leaves, flowers, and remove any damaged fruits to help your plant better survive disease activities." |
| Product Drawbacks | Monterey Liquid Copper Fungicide RTU will not control major disease outbreak and works mainly as a protectant. |
| Target Pests | Black Spot, Downy Mildew, Leaf and Fruit Spot, Fruit Rot, Late Blight, Leaf Curl, Powdery Mildew, and Rusts. |
| Application Equipment | Gloves |
| Application Methods | Spot Treatment |
| Active Ingredient | Copper Octanoate (Copper Soap) 0.08% |
| Product Type | Fungicide |
| Formulation | Ready-To-Use |
| Application Rate | Apply 1 quart of Monterey Liquid Copper Fungicide RTU to treat 10 square yards. |
| Shelf Life | Monterey Liquid Copper Fungicide RTU will last for 3 years when stored in a cool, dry area that has temperatures above 40 degrees Fahrenheit. |
| Yield | One quart of Monterey Liquid Copper Fungicide RTU will treat 10 square yards. |
| Use Sites | Indoors, Outdoors |
| Time to Kill | Monterey Liquid Copper Fungicide RTU will begin working to protect plants and cure some disease outbreak within 7-10 days. |
| Comparable Products | Natural Guard Copper Soap Fungicide RTU |
| EPA Registration # | 67702-1-54705 |
*Price does not include freight. We guarantee our rate plus shipping will be less than anyone else's price.



