Bonide Captain Jack's Copper Fungicide, 16 oz Ready-to-Spray Disease Control for Organic Gardening, Controls Mildew & Blight

Our arborist (i.e. tree guy) told us we had a fungal rot spreading through our trees killing them. He suggested we try this product versus other more expensive methods that could cost us $1000 or more. This product takes several applications over the course of a year to remove the rot but if you are willing to roll up your sleeves and spray your trees every few months, it definitely solves the problem. Trees are green now and no visible evidence of fungus remains. Amazon had by far and away the best pricing compared to other stores.

Best to apply in spring when new green leaves are first coming out. Re-apply in summer and if need be at end of summer before leaves begin to fall. It took care of a bad rusty fungus that was getting on everything! Must be vigilant to keep at bay, especially in the beginning. This product works great.

This has helped keep leaf spots and mildew at bay in my veggie patch. It’s easy to mix and apply, though I did have to unclog the nozzle once during a second application. Still a reliable choice for seasonal garden care.

So much easier than having to mix into a spray bottle & no mess. Has a wide range & covers a large area.

I have been struggling with leaf curl on my peach tree for years which unfortunately means that I grew very few peaches or none at all until I purchased this product. I sprayed my tree in the fall of 2024 after all the leaves fell and then again in the spring of 2025 before the tree started to bud and we had no leaf curls and had hundreds of peaches on the tree. It's very easy to use, just connect it to your hose, turn on the water and spray the tree. Great product that I will continue to buy every year.

This really helped with my tree in the backyard. The leaves looked very sickly, after doing research on what could be causing it I bought this fungicide. I sprayed it on as instructed and in just a few short days I could already see the overall improvement of the leaves. It worked fast and did exactly what I wanted it to do

The copper fungicide is excellent for my trees, but the hose end container was not effective in delivering the chemical. Chemical solution is too thick to be delivered from the bottle. I checked with second bottle and it too didn't deliver the chemical.

This works well on everything but "rust"... Used twice and still have rust on cantalillies and plumeria, was happy that my chickens were not affected