Ready-to-Use Copper Fungicide

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.

Worked great

This worked somewhat on my miniature rose’s bad case of powdery mildew. But ultimately what really helped it was cutting it down by a third, thereby removing a lot of the infected foliage. Fortunately the foliage has since grown back and it is starting to do better. I think this product does work on powdery mildew. For the spots it touched were clear of mildew in a few days. But unfortunately I gave my rose too much water and forgot to empty the tray under it. So it looks a little washed out right now. But since I corrected that it is getting greener again. So pay no attention to the paleness of my rose in the photos. But if you have a little powdery mildew on your rose, maybe consider this product. But if you have a bad case of it on your rose, maybe consider just cutting off the afflicted parts or trimming it down by 1/3. Might be more prudent in the case of a bad powdery mildew infection. Plus roses hate herbicide and pesticides. So you should use this fungicide only a little bit and as little as possible too. Using this product too much can make your roses sick or kill them. So remember only to use a little bit of it for your roses. And avoid herbicide and pesticides altogether whenever possible. And if you must use herbicide and pesticides make absolutely sure that they are ROSE SAFE. Update- while this case treat fungus like powdery mildew, I would not recommend it for any fungus other than what it is meant to treat. Copper fungicide is quite potent and usually only used as a last resort. I would suggest something else for edible food. Look into vinegar spray. Maybe it would help with edible food. Also I wound up having to mostly defoliate my rose. That saved it, I believe. It is now doing much better.

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.

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.

Great product

Didn't seem to do the job for me. Sprayed my palm a couple times but fungus did not stay away so just tossed the plant.

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.