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

This product definitely works, but it works best in the early stages of disease in plants. I have plants that had slight powdery mildew and it cleared it up in one day. MY tomato plant with severe blight though was not so lucky. I dont think anything can save that plant at this point but I figured I'd try. I'll keep spraying it over the next few weeks to see if it can control it.

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.

Product worked well on my young mango trees with white powdery mildew but a bit expensive for the quantity of product.

I live in Phoenix, where the dry heat can be tough on plants, and my orange tree started showing signs of leaf spot. I tried Bonide Captain Jack’s Copper Fungicide and was really pleased with the results. After a couple of applications, the tree looks much healthier and the leaf issues have cleared up noticeably.I appreciate that it’s organic and safe to use on fruit trees. The ready-to-use spray bottle is convenient and easy to apply, even in the early mornings before the heat kicks in.

For this for my hydrangeas because they had spots on their leaves. I have used a couple of times now and it appears to be helping with the spots. You just spray on every 7 days and seems good quality so far. I think great value for the money I would buy again.

Got this because a plant app suggested this type of remedy for the brown papery spots and dry points on my dracena. After quite a few applications over several months the issue seems better but not totally resolved.

I can't believe it worked overnight! After giving my Swamp milkweed a light spritz, all brown spots were gone the next day. I wish I had known about this product two years ago, when I lost all my pollinators plants to leaf fungus.

Time will tell if it works but it was fairly easy to apply.