#1 Home Improvement Retailer

Internet # 203911375

Model # 811

Store SKU # 1003276204

Top Rated

Captain Jack's Copper Fungicide, 16 oz. Concentrate for Organic Gardening, Controls Common Diseases

$18.97
  • Curbs the growth of mildew, black spot and other listed diseases
  • Easy application with a hose-end sprayer or tank sprayer
  • Used for vegetables, roses, fruits, ornamentals and more
  • View More Details

Free & Easy Returns In Store or Online

Return this item within 90 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

AI-generated from the text of manufacturer documentation. To verify or get additional information, please contact The Home Depot customer service.

Product Details

About This Product

Control common plant diseases in your lawn and home garden with Captain Jack's liquid copper fungicide concentrate. This product uses low concentrations of copper for control listed plant diseases. Approved for organic gardening, copper fungicide can be used on a variety of listed fruits, vegetables, nuts, herbs and flowers, and can even be applied up to the day of harvest. Captain Jack's copper fungicide is effective against common fungal diseases including downy mildew, black rot, leaf spot, powdery mildew, blight, peach leaf curl and more. This concentrated solution arrives ready to mix with water. For best results, shake well mix according to instructions on the product label. Apply thoroughly to the tops and undersides of leaves and all plant surfaces on affected plants. Repeat every 7-10 days as needed. Please see product label for full use instructions.

Highlights

  • Control fungus and disease in your lawn and garden with Captain Jack's liquid copper fungicide concentrate
  • Approved for organic gardening, this fungicide is suitable for the production of organic produce and can even be used up until the day of harvest
  • Copper fungicide is effective in the control and prevention of a wide range of plant diseases; listed common garden diseases include blight, black spot, powdery mildew peach leaf curl and more
  • Apply copper fungicide to fruits, vegetables, ornamentals and other plants in your lawn and garden for complete and long-lasting disease control
  • Product arrives conveniently ready-to-mix; to use, mix with water according to package directions and thoroughly apply to affected plants; please see product label for full use instructions
  • Return Policy

Product Information

Internet # 203911375

Model # 811

Store SKU # 1003276204

Specifications

Product Width (in.): 4.0 in

Dimensions

Product Width (in.)

4.0 in

Details

Application Type

Sprayer Application

Concentrated or Ready to Use

Concentrated

Disease Type

Black Spot, Downy Mildew, Early Blight, Leaf Spots, Powdery Mildew, Rust

Diseased Plant Type

Flowers

Indoor/Outdoor

Outdoor

Organic

Yes

Pack Size

1

Plant Type

Beans, Camellia, Citrus, Clematis, Corn, Crape Myrtle, Echinacea, Euonymus, Ferns, Ficus, Grapes, Hibiscus, Holly, Honeysuckle, Hostas, Hydrangea, Potatoes, Rose, Tomatoes

Returnable

90-Day

Safe for Edibles

Yes

Spray Application Type

Concentrate

Questions & Answers

How to use this product?
ByAug 2, 2026
0 Answer | 
Answer This Question

Sprinkler water washes it off
ByJul 20, 2026
0 Answer | 
Answer This Question

what is the measurements for putting in a spray bottle
ByMay 19, 2026
0 Answer | 
Answer This Question

How many ounces of usable prduct does the concentrate make?
ByMar 13, 2026
0 Answer | 
Answer This Question

I have. Mt St Helen’s plum trees with black knot ! Will this be effective in control of the black knot ? What would be appropriate mix ratio n application timing ? Using concentrate in hose sprayer. Thank you
ByMar 9, 2026
0 Answer | 
Answer This Question

Will this work on Mount St. Helens plum with black knott ?
ByMar 8, 2026
0 Answer | 
Answer This Question

Will this fungicide help with Bitterrot & black rot on Muscadine Vines? KC Express
ByMar 4, 2026
0 Answer | 
Answer This Question

does it work on lime trees for citrus canker
ByNov 29, 2025
0 Answer | 
Answer This Question

Viewing 1-8 of 61

Customer Reviews

4.5 out of 5

  • 4.5 out of 298 reviews
  • 88% recommend this product
Filter by:
Showing 1-10 of 298 reviews
We have been using the Bonide Captain Jack's Copper Fungicide for fruit trees and roses for the past several years. Simply mix it with water and spray the mixture on leaves (including the underside) in late winter/early spring. So far it appears to work.
by
I like Captain Jacks Copper Fungicide because it is a mild copper spray with much less chance of burning buds or contaminating soil. It works well and mixes with water. No problems with clogging my sprayer.
by
Works good on roses!
[This review was collected as part of a promotion.] My mother’s roses responded well to this fungicide! The directions are easy to follow and the ingredients aren’t crazy. I’m still a little cautious about putting it on vegetables you’ll eat but I’m sure it works good on that too.
by
    Great quality product!
    [This review was collected as part of a promotion.] My Don Juna picked up a bit of powdery mildew. Caught it early and this stuff knocked it out. Rose is growing great in it's first season. Highly recommend!
    by
      Effective, but BYO sprayer
      [This review was collected as part of a promotion.] I like to use copper as a fungicide on my edible plants rather than a synthetic product. This was effective at improving leaf condition after a difficult summer for the garden. Do keep in mind that you'll need to mix this up with water in a garden sprayer -- it's not a ready to use product. Diluting the product according to directions means a little goes a long way
      by
        Undecided
        [This review was collected as part of a promotion.] Jury’s out on this one. I can’t really tell that it did much for my lawn. Maybe it needs longer to show progress. I’ll have to come back and update this.
        by
          Effective and Fast-working!
          [This review was collected as part of a promotion.] ⁦I recently had a couple of houseplants that all had some sort of fungus. The leaves would get brown spots that continued to grow till the leaf fell off. When I received this product, I was thrilled because it's exactly what I needed and it was right on time!! I followed the directions and used the product, immediately. First you trim all the brown spots from the leaves, then spray both top and bottom of each leaf. It worked perfectly, leaving no more brown spots and within only a few days! I am continuing weekly treatments and the plants are healthy again. If you follow the instructions, the results are amazing! 10/10 would recommend.
          by
            Holy grail
            [This review was collected as part of a promotion.] I wish I had a before photo, but I have had this rosebush for eight years and it has never been this healthy or had this many blooms! The only thing I’ve done is add this product. I will religiously use this on my roses from now on. 
            by
              My plants are thankful!
              [This review was collected as part of a promotion.] Lately I’ve been giving my green thumb a try, and this copper fungicide help me achieve my healthy plant goals! It kept any signs of mildew or rot away from my little garden. This is a must have if you want a flourishing garden! Thank you influenster for this product in exchange for my review!
              by
                Easy application and effective
                [This review was collected as part of a promotion.] Bonide is an excellent brand, and I use many of their products on my houseplants. This copper fungicide, in particular, worked great for an issue I was having with one of my plants. I just mixed it as directed into a spray bottle and applied it to all the leaves on my plant. I did this 3 times in a month, and the issue is gone. The application is simple, as are the directions. There's no scent, I'm my opinion. I just suggest keeping the plant out of direct sunlight for a few days following application. You can not go wrong with this brand. It truly is one of the best out there.
                by
                  Showing 1-10 of 298 reviews

                  Compare Key Features

                  current item

                  Product Snapshot

                  Ideal for organic gardeners seeking effective disease control. Controls a wide range of diseases on fruits, vegetables, and ornamentals.
                  Ideal for organic gardeners seeking a 4-in-1 pest and disease control for various plants, ensuring safe and effective protection.
                  Ideal for organic gardeners seeking a 4-in-1 pest, disease, and mite control for various plants, ensuring healthy growth.

                  Coverage Area

                  Formulation Type

                  Concentrate
                  Concentrate

                  Organic Certification

                  Spectrum of Control

                  Blight, black spot, powdery mildew, peach leaf curl
                  Insects, mites, mildew, and other pests and diseases

                  Application Method

                  Ready to use spray