Monterey Liqui-Cop

4.5 out of 5 stars 6 Reviews | 50 Q&A

Monterey Liqui-Cop

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Average Rating

4.5 out of 5 stars Rating: 4.5

6 Reviews | 50 Q&A

Product Overview

Monterey Liqui-Cop is a natural liquid application formulated to control and prevent diseases on fruit and nut trees, citrus trees, vegetables, and ornamental plants. Liqui-Cop is a very weatherproof product that does not easily wash away or degrade in sunlight. It does not require additives to make it more effective, and can be used in place of lime and sulfur applications. Liqui-Cop can be mixed with other horticultural oils.

Features and Specs

Active Ingredient Copper - ammonia complex 27.15%
Target pests Anthracnose, rots, scabs, blights, spots, cankers, pitting, mildews, and many others
* See label for complete list
For use in Fruits, nuts, vegetables and miscellaneous plants
Application Fruit and nut crops: 0.5-4 teaspoons per gallon of water

Citrus Trees: for brown rot - 1-3 teaspoons per gallon of water

Vegetables: 1-6 teaspoons per gallon of water

Ornamentals: 2 teaspoons per gallon of water
* See label for complete application instructions
Pet safe Yes, when used as directed on label - Safe once dried
Shipping Weight 1.33 lbs
Manufacturer Monterey Lawn & Garden (Mfg. Number: LG 3100)
UPC 022179100114
EPA Registration 54705-7



The control of diseases with fungicides is based on PREVENTION. Plant surfaces must be completely covered with the fungicide to successfully prevent infection. Copper pesticides are considered preventative, not curative of plant diseases. Use the highest indicated rate when disease incidence is high or expected to be, depending on rainfall and temperature. The lower rate is suitable for general preventive sprays under normal conditions. Since weather conditions and disease incidence vary, consult your Agricultural Extension Service for timing and initial application.


Seek advice on identifying specific disease problems and solutions from your local Agricultural Extension Agent or other knowledgeable persons. Partially fill the spray tank/container with water. Add the desired amount of LIQUI-COP and continue filling the tank/container. If applied with other products, add LIQUI-COP last. Agitate the tank during mixing and application until tank is empty. A plastic or metal stirring stick should provide adequate agitation.

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  • 5 of 5 Stars

    Great Product for Veg & Tree Diseases

    By Donna on 11/03/2016

    I've used this for diseases on pecan, Magnolia fuscata (Banana Magnolia), fig, tomato, cabbage, cauliflower, broccoli, peppers. Works great if you catch it on time. I first started buying the pints, then finally found quarts. Use as directions state, usually 3 Tbsp per gallon.

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    21 of 21 people found this review helpful

  • 5 of 5 Stars

    Great job!

    By Yelena on 03/17/2018

    Fast delivery. Great communication. Item as described. Recommended!

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    4 of 7 people found this review helpful

  • 2 of 5 Stars


    By Steve on 08/01/2020

    You could not provide the quantity of product I desired. I got one bottle not one case. Other product could not be shipped to Oregon, which is just weird because every garden and landscape store locally carries the product, just at a higher price. (Dormant Spray Oil) So let me know when I can re-order Liqui-Cop by the case.

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    1 of 3 people found this review helpful

  • 5 of 5 Stars

    Good Prevention for Tomato Wilt

    By Hugh on 07/22/2022

    I mix this product in a hand-held sprayer and apply it after each rain. This helps protect the plants from early death due to tomato wilt. I can keep my plants producing until first frost. It is a relatively cheap solution for tomato wilt.

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  • 5 of 5 Stars

    Monterey Liqui-Cop 1 gallon

    By Paul on 12/18/2022

    Easy to order, quick delivery, good price, arrived in good shape and well packaged.

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See all 6 customer reviews

Questions & Answers

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How long will Liqui-Cop be effective after it is mixed?

Monterey Liqui-Cop should be used within 24 hrs of mixing with water.

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71 of 74 people found this answer helpful

How many days after spraying Monterey Liqui-Cop do I have to wait to eat the tomatoes?

I'm using Liqui-Cop for early blight on tomatoes. I don't want to ingest the spray residue. Will it safely wash off of tomatoes?


According to the manufacturer, your tomatoes can be harvested 4 days after your last application of Monterey Liqui-Cop and they will be safe to eat once you wash them thoroughly.

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59 of 64 people found this answer helpful

Is Monterey Liqui-Cop safe for bees?

We spray our trees with LiquiCop and would like to start bee hives on our property. Will this product hurt the bees?


There should be no problem using Monterey Liqui-Cop in an area where there are bees. We would advise avoiding spraying directly to flower blossoms or during times when pollinators are present as the direct spray may have toxicity to bees or other insects if contacted directly.

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39 of 40 people found this answer helpful

How much Monterey Liqui-Cop is recommended to treat roses with Black Spot?

Yes, Monetery Liqui-Cop is labeled to treat Black Spot on rose bushes. Apply as a thorough coverage spray using 2 teaspoons of LIQUI-COP per gallon of water. Begin application at first sign of disease and repeat at 7-14 day intervals as needed. Use shorter interval during periods of frequent rains or when severe disease conditions persist. Do not apply more than 460 tsp. of LIQUI-COP (0.46 lbs. metallic copper) per 1,000 sq. ft. per year.

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32 of 35 people found this answer helpful

Can Monterey Liqui-Cop be applied if the temperature drops to 40 F degrees?

Per the manufacturer, Monterey Liqui-Cop can be used at any time except when temperatures are at or below freezing.

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28 of 29 people found this answer helpful

See all 50 customer questions

Monterey Liqui-Cop 4.5 out of 5 stars Rating: 4.5 (6 Reviews / 50 Q&A)

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