Bonide Captain Jack's Copper Fungicide, 32 oz Ready-to-Use Spray for Organic Gardening, Controls Common Diseases, for Fruit Trees, Vegetables & Ornamentals, 1 lb | For Organic Gardening, Controls Common Diseases on Plants

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.

This Copper Fungicide has saved a plant for me...again! This time it's a big crape Myrtle that I thought was down for the count with dusty mildew. We had had weeks of rain and the air circulation is not great where it stands. I did cut the affected branches off and then sprayed the remaining branches, using over half the bottle. Lo and behold, it worked. This is an amazing product that has taken care of brown spot on jasmine, a euonymous bush and a jade plant. It's fabulous and affordable!

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.

Purchased this because it was recommended to me in my gardening group as my tomato plants are experiencing early blight. After trimming 90% of the plant and having almost nothing left, I tried a DIY formula of dish soap, oil and baking soda, but the disease continued to attack my plants so I purchased this. The instructions on this organic copper spray say to cover the plants top to bottom, underside and top side, as well as the fruit. I did as directed and after only two days of use the blight disease seems to have been combated. I no longer have any curling leaves and no new spotted affected leaves or fruit. So far I would say that this worked and with only one treatment! Being it is premix, it’s very easy to use. The bottle did not leak at all, and the scent was not anything strong or overpowering. I like that it is organic because obviously I am spraying food that I intend to eat, and I also have pets. Overall, for the size of the bottle I feel like it is priced accordingly. I find this to be a quality product. Should anything change I will update my review.

Worked very well. No scent. Easy to use. Sprays easily though a battery handheld option would be better. Durable. No affect on mosquitos.

This copper fungicide product has been very helpful in dealing with blossom blast infection of my Asian pear tree. It could prevent the fungus from rapidly spreading across the tree and infecting other branches. Note that it does have to be applied in regular intervals. I have to see if it can prevent the fungus from developing in the first place during next year's cycle. I also used this product on a rose bush with rust on the leaves. The bush lost all its leaves initially but recovered completely with new leaves and growth. I am very pleased with the efficiency of this product.

Seemed to work as described. Not sure if it completely got rid of fungus. May have waited to long after plants infected?

This product is good for organic gardening, safe to use, consistency is liquid - comes in a size that is easy to use not bulky - durable - and minimal scent - recommend.