Bonide Captain Jack's Copper Fungicide, 32 oz Ready-to-Use Spray for Organic Gardening, Controls Common Diseases

At the beginning of the season, I noticed some black spots on my young tomato plants. After some research, I ordered this fungicide and followed the directions. Not only did it clear up my plants, but I did not have any return of the black spots, and I had more tomatoes this year than I have ever had. The plants were healthy and productive.

I wasn't real keen on spraying but did a lot of research and this product seemed to be as 'organic' as organic can be. There was no smell. It did kill the bugs (not right away) but I did notice after a good coating the bugs were less. Good size and value for the cost. I have nothing bad to say about this product. Worked well on my grapevines and apple trees.

I had a persistent red fungus attacking the leaves on my peach tree. It was aggressive and spreading fast. I used this product as directed and also pulled off the affected leaves. While I still saw some fungus after the first application, it was definitely reduced. Here’s the twist: This year, there’s zero sign of the red fungus, and my tree is bigger and healthier than ever. Did Captain Jack’s do the trick? Maybe! I can’t say for sure if it was the spray, the winter, or a mix of both, but I do believe this fungicide played a part in getting my tree back on track. It may not work overnight, but if you're consistent and patient, this product seems to help. A solid addition to your garden toolkit, especially if you're battling stubborn leaf issues. The smell is non-toxic. The bottle spray worked well. My peach tree is now two years old, so it's still relatively small. This bottle was more than enough for my one tree and many uses.

Works great but there is better products. Easy to use

I used this product, Copper Fungicide, on my fig tree, as a prevention for fig rust. I also used it on my zucchini plants, which were showing signs of powdery mildew. It worked well in both cases. The spray came out quickly and easily. It is easy to adjust the nozzle You cannot use the container upside down, but have to lower it and awkwardly spray upwards, but it is easy enough to use. Be careful not to spray it when it is windy, as you don't want it spraying in your face. Wear gloves and wash your hands as a precaution, after using the spray.

Bonide Captain Jack's Copper Fungicide is a top-notch solution for protecting your plants from a wide range of fungal diseases. This ready-to-use formula is ideal for both organic gardeners and those looking for an effective, environmentally friendly way to manage issues like powdery mildew, downy mildew, blight, and leaf spots. What sets Captain Jack's Copper Fungicide apart is its versatility; it can be used on a variety of plants, including vegetables, fruits, ornamentals, and flowers. The active ingredient, copper octanoate, is a naturally occurring compound that acts as a protective barrier, preventing fungal spores from taking hold on plant surfaces. Gardeners love the ease of application—simply spray it on the affected areas and let it work its magic. The product is rainproof once dry, ensuring lasting protection even in unpredictable weather. Many users have reported seeing a significant reduction in fungal issues after just a few applications, with healthier, more vibrant plants as a result. Bonide Captain Jack's Copper Fungicide is an essential addition to any gardener's toolkit, providing peace of mind and reliable disease control that helps keep plants thriving throughout the growing season.

Works as described be patient. Does not destroy foliage.

Background: New England Zone 6a/6b (big snow, ice, and frigid winters), first attempt at growing citrus in container pot. I know, who up here even tries! Gourmet chef (or sad Wannabe) whom cultivates my own herbs for my dishes year-round. Subject: ~ 2’ tall Meyer lemon tree in container pot. Situation: Never used a fungicide before, but total success with Captain Jack’s de-bug product. For those new to the line, I can’t emphasize enough how important it is to read their products’ comprehensive brochures from beginning to end before using. I bought this copper fungicide product to help me combat what I suspect was early powdery mildew on my baby Meyer lemon tree. The tree is my very first citrus, in a container I immediately transpotted with bottom pebbles, Coast of Maine organic worm-casting potting soil, lots of perlite for better drainage and to monitor its roots through the clear plastic. Success! It was thriving all summer outside, and even exploded in new blooms and put out about 15 baby lemons, most of which dropped (because Meyers sacrifice when it senses its young stems can’t support). Then I brought it indoors to winter, still fruiting with three green globes, and placed it under one of my grow lights in a heated low humidity room. What baffled me was, despite my attention to the amount of natural light, temperatures, and minimal water it demanded, it was suddenly showing signs of mildew. To my surprise, the fungicide’s brochure explained how powdery mildew is unique and doesn’t require any water to take hold. It made sense. Remedy: I’ve cared for all of my indoor plants either where they are or in my kitchen sink. But being I’m so fond of this little lemon tree, it’s got thorns to kill, and I mean business, this one wasn’t going to be just a sink job. Armed with the Captain Jack’s fungicide, I first removed and pitched the topmost crust of soil and anything dead or remotely white, then sprayed-turnedover-sprayed the first few inched of soil, lower stems, and lower leaves in the sink. Then when dry, I moved it to the tub, massaged the top two inches of soil with more spray, and retreated the tops and underside of every leaf. I let it air dry. The most egregious white spots reappeared as it dried, but I resisted the temptation to spray it again, knowing the fungicide just takes time to work. I returned it to its place under its grow light (a Soltec canister beam). One week later, the Meyer Lemon’s leaves, while not out-of-the-woods, are showing signs of stability, if not improvement. New buds have emerged at many stem’s ends, and its spikes have grown and hardened, as if to protect its remaining nascent fruit. The fruit is looking good. 🍋 Another week later, the tree is looking great, with only a few tiny stubborn (or resistant) patches of powdery mildew (?) remaining. The 3 fruits look great, and all but one of the many new buds are growing. It’s lost no leaves since last week, and definitely thriving. I reapplied the fungicide spray again to the fruit, leaves, and soil. Conclusion, Captain Jack’s Copper Fungicide saved my Meyer Lemon.