Monterey® Liquid Copper Fungicide - 32oz - Ready-to-Use Trigger Spray - OMRI Listed®

Monterey Liquid Copper Fungicide 32oz -- Ready-to-Use | Dormant & Growing Season Disease Control

Monterey Liquid Copper Fungicide is a Copper Octanoate (Copper Soap) fungicide for dormant and growing-season disease control on flowers, fruits, and vegetables in home gardens and home greenhouses. The copper octanoate active ingredient disrupts fungal enzyme systems and cell membranes on contact, providing control of powdery mildew, rusts, black spot, leaf and fruit spot, downy mildew, fruit rot, late blight, and leaf curl. Labeled for use up to the day of harvest. This 32oz ready-to-use trigger spray requires no mixing -- spray directly from the bottle.

Key Features & Benefits

• Copper Octanoate (Copper Soap) Fungicide: Provides multi-site fungal disruption -- an important property for resistance management -- along with activity against bacterial diseases such as fire blight.
• Dormant & Growing Season Use: Apply as a dormant spray before bud break to reduce overwintering fungal inoculum, or during the growing season to control active infections.
• Broad Disease Spectrum: Controls powdery mildew, rusts, black spot, leaf spot, fruit spot, downy mildew, fruit rot, late blight, and leaf curl.
• Day-of-Harvest Safe: Labeled for use on edible crops up to the day of harvest.
• Ready-to-Use 32oz Trigger Spray: No dilution or measuring required.

Disease Control Spectrum

Controls: Powdery Mildew, Rusts, Black Spot, Leaf Spot, Fruit Spot, Downy Mildew, Fruit Rot, Late Blight, and Leaf Curl. Check the current product label for the complete pathogen list and application rates.

Frequently Asked Questions

What diseases does Monterey Liquid Copper control?

Monterey Liquid Copper controls powdery mildew, rusts, black spot, leaf and fruit spot, downy mildew, fruit rot, late blight, and leaf curl. This broad range of fungal and bacterial plant diseases affects common garden crops and ornamentals alike, so a single application often addresses more than one problem at once.

When should I apply Liquid Copper as a dormant spray?

Apply the dormant spray to trees and shrubs before bud break in late winter or early spring to reduce overwintering fungal and bacterial inoculum. This is particularly effective for managing diseases like leaf curl on peach and nectarine trees.

Is Monterey Liquid Copper safe for edible crops?

Yes. Monterey Liquid Copper Fungicide is labeled for use on fruits and vegetables up until the day of harvest. Follow label instructions for application rates and any crop-specific guidance.

What is the active ingredient in Monterey Liquid Copper?

The active ingredient is Copper Octanoate (Copper Soap), a copper-based fungicide that disrupts fungal cell membranes and enzyme systems on contact. This is distinct from copper hydroxide or copper sulfate formulations used in some other copper fungicides.