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Copper-based fungicide for use in organic gardening. Helps suppress and control diseases like brown rot blossom blight, downy and powdery mildew, peach leaf curl, fireblight, rust, leaf spot, and more — for fruit trees, berry plants and vines, vegetables, and flowers. Ready to use. Label includes instructions for application as a dust or as a spray. Intended for use as a modern replacement for bordeaux.

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Questions & Answers

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Browse 31 questions Browse 31 questions and 62 answers
Why did you choose this?
Stark Bro's Store
Hopefully kill fungus on peach trees
Bill J on Dec 26, 2020
I lost 3 cherry trees last year due to mold, time to stop that from happening this year.
Gary K on Mar 17, 2020
Hopefully kill fungus on peach trees
Bill J on Dec 26, 2020
I need it for my peach trees
Courtney P on Nov 27, 2020
I lost 3 cherry trees last year due to mold, time to stop that from happening this year.
Gary K on Mar 17, 2020
Mold killed 3 of my cherry trees last year
Gary K on Mar 11, 2020
Protect the plants
Jeffrey P on Mar 2, 2020
Organic product which I hope will control peach leaf curl.
Kelly S on Feb 22, 2020
FRANK F on Feb 1, 2020
It will work the best for hard fungicide infestation
andy on Jan 6, 2020
Googled fungicide for my peach trees and wanted a product I could use as a powder on ground
Tracie R on Nov 11, 2019
It works
cobi h on Sep 9, 2019
Necessary grape fungicide
John T on Dec 24, 2018
Recommended by Stark Brothers for "Shot hole." Their recommendations are usually on target.
JAMES D. on Sep 3, 2017
Good for grapes
Charles S on Jan 8, 2017
Need treatment for peach tree leaf curl.
Cheryl K on May 30, 2016
Recommended by local apple grower.
Joan D on Mar 30, 2016
Need to stop mildew on some of my flowers example roses and zinnias.
JANET M on Mar 7, 2016
I need it for my peach trees
Courtney P on Nov 27, 2020
Mold killed 3 of my cherry trees last year
Gary K on Mar 11, 2020
We have a serious leaves.curl desease on my peach tree, now is early June fruits already form , is it too late to apply the copper fungide treatment ?
Anh T on Jun 5, 2016
BEST ANSWER: Once symptoms of leaf curl appear, it is too late to control the disease that season. Fungicides are not effective against this particular disease after budbreak. Prune your tree this fall, remove and destroy the fallen leaves and pruning debris, and then make your leaf curl application (as directed by the product label) while the tree is dormant.
how much do i use to spray peach trees?
silviodenunzio on Mar 21, 2016
BEST ANSWER: I have only used it on very young trees (apple, pear, peach and cherry). I mix the powder iwith water in a spray bottle and spray the leaves and stems/trunk with the spray so that a thin layer of spray is left behind. When it dries it looks like a dusting of powder. If you use too much it will just wash off in the next rain, so that is not a big problem (except wasting the product/money). The product is essentially non-toxic, so it will harm other vegetation when it washes out, and it will not pollute waterways (unless you dump the whole container in a stream, but who would do that!). Too little (if you can't see the dusting at all when dry) will not give you protection. Good luck and happy peaches!
Can this be mixed with dormant spray oil?
David D on Nov 12, 2017
BEST ANSWER: Yes, it can, and the oil actually helps the fungicide adhere to the leaves better than it would without the oil. The two will not interact in any harmful way.
how much does one bottle make in gallons?
Lisa B on May 9, 2016
BEST ANSWER: There is no way to offer this information accurately because, depending on what you're spraying (apple tree, blueberry plant, etc.), the amount of product you use per gallon of water varies to a great degree. Take a look at the label here:
can copper be used on pear trees for fireblight ?
MARK S on Jan 21, 2017
BEST ANSWER: Here's an answer posted by another customer: "I have used the copper fungiside to treat Fireblight on a pear tree. I have seen no sign of it hurting birds that love to sit in the pear tree."
On my pear tree i noticed black spots causing leaf curl, will copper fungicide stop it? Do I need to prune the pear back on the effected area or just pluck the leaves?
Pamela T on Apr 13, 2020
BEST ANSWER: I recommend removing leaves with the worst spots and branches heavily effected. This should work on newly-infected leaves and branches if you get them early enough and apply it in larger quantities.

Dr F
How often would copper fungicide be sprayed on trees? I am new to this and read where other sprays are every few days during bloom period. Is Copper similar or just once?
Blake M on Mar 27, 2020
BEST ANSWER: Make initial application at silver tip. Apply every 5-7 days at green-tip. Do not apply after green-tip reaches 1/2???.
What is the shelf life of the copper fungicide?
Laura J on May 26, 2020
BEST ANSWER: Copper octonate is the active ingredient and according to an EPA document
shows no degredation after 15 months of storage. Given that this is a pretty common copper chemical and as long as it's not baked in the sun and kept dry I would imagine that the powdered form in this product is stable for a long time. Direct sunlight and high humidity in the container could cause it to break down over time but I store mine sealed tight in its container in my shed and after two years it still seems to work fine. I hope that helps, God Bless!
would this fungicide treat black canker on my willows?
Juan M on Apr 27, 2020
BEST ANSWER: The best treatment I have found and used is called black knot be gone is a organic treatment can be found and ordered on the net also on you tube
Will it help cankers on a sugar maple?
Timmy on Jul 8, 2018
BEST ANSWER: Yes, it will. You can also use Fungonil, which has a broader spectrum: //
how do I get rid of apple borer?
Nancy S on Jun 2, 2017
BEST ANSWER: I use bonide fruit tree spray
Is this harmful to hummingbirds or birds in general?
Michael G on Aug 4, 2020
BEST ANSWER: We appreciate you reaching out to us. These treatments may contain toxic chemicals that can harm hummingbirds. ... For example, fixed copper fungicide will treat brown rot and citrus blasts -- which affect citrus trees -- but is nontoxic to birds and bees. Sulfur fungicides are also safe to use around hummingbirds.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
I have 2 year old apple trees with no fruit yet. I need to use fungicide due to come leaf curl and rust spots on leaves. when can I apply?
Linda F on Jul 1, 2020
BEST ANSWER: We appreciate you reaching out to us. Ideally, apply copper fungicide before fungus is visible. Otherwise, apply the product immediately when you first notice signs of fungal disease. If the fungus is on fruit trees or vegetable plants, you can safely continue to spray every seven to 10 days until harvest.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
would this be a danger to my chickens?
Got Rocks on Feb 19, 2020
BEST ANSWER: Take the bottle to your local vet???s they can answer that question better than I cat
Label states:"Ready to use. Label includes instructions for application as a dust or as a spray." How is it applied as a dust; is an applicator available?
David K on Feb 1, 2020
BEST ANSWER: I used it as a spray
What do I use to deter rabbits from my garden and yard?
Rima t on May 8, 2019
BEST ANSWER: This works very well to keep both deer and rabbits away: //
Says to apply when its going to be wet out. Don't that make it wash off?
Shelley B on Apr 11, 2019
BEST ANSWER: This is a dust, which is dry. When it gets wet, it adheres to the leaves better.
I am looking for organic fungicide and see one that has RTU at the end. What is RTU?
Ron S on Feb 26, 2019
BEST ANSWER: That just means "ready to use" vs. a concentrate that needs diluting prior to use.
What do i need to protect both Peach and Pear trees?
William G on Sep 10, 2018
BEST ANSWER: I bought bonide copper fungicide and fertilome fire blight spray, fertilome fire blight spray worked very well on my Apple, peach and pear trees. I have not used the bonide yet.
Can you spray in late June?
Patrick C on Jun 18, 2018
BEST ANSWER: According to the manufacturer, this product is will not damage plants in June heat. Here is a link to the label for exact directions regarding what kind of tree or plant you are treating, and what you are treating it for://
What are the exact ingredients and their percentages?
Katherine D on Apr 8, 2018
BEST ANSWER: Here is a link to the label: //
how much powder to add to water for spraying for grapes?
Elizabeth W on Jun 11, 2017
BEST ANSWER: This is a liquid product. The label says to mix 0.5 to 2.0 fluid ounces of this product in a gallon of water. Repeat application every 7-10 days if necessary. Here is a link to the package label: //
I have orange sawdust on a couple of my apple trees. Anyone know what this is and how to get rid of the source? The orange material is on the root bulb.
Nancy S on Jun 2, 2017
BEST ANSWER: You most likely have wood borers. You will need a pesticide to keep them under control as this product is for working on fungus. bonide does have some other good products for dealing with pests.
What is the best way to apply this product to Grapes and can I apply it to my tomatos with the same leaf spot issues?
Harry D on Apr 20, 2017
BEST ANSWER: This product is recommended for grapes as well as tomatoes. Your options for applying the product are either as a dust or mixing with water in a tank or hand sprayer. The application instructions for both methods are included on the label.
I would like to use on my cherry trees this spring if necessary. Last August they seemed to get fungal rot and dropped their leaves. Is this the right approach?
c h on Apr 12, 2017
BEST ANSWER: Yes! This is an excellent product for fungal disease.
Use on Asian pear, plum, apricot ?
Isidro on Jan 29, 2017
BEST ANSWER: According to the current label, this product can be used on Apple, Blackberry, Blueberry, Caneberry (Boysenberry, Loganberry, Marionberry, etc.), Cherry, Garlic, Grape, Nectarine, Onion, Peach, Pear, Potato, Quince, Raspberry, Roses, Strawberry, and Tomato.
In the directions for spraying pears it says to use Hydrogenated lime. Will calcium lime (like Super Sweet) work as well?
Joanne C on Jan 5, 2017
BEST ANSWER: Hydrated lime and calcium hydroxide (typically used for "sweetening" soil/raising pH) are the same thing. What you're reading is likely referring to creating a Bordeaux mixture, which can be combined for use with the copper fungicide, but is not mandatory.
Will these sprays hurt birds?
Melissa M on Jun 9, 2016
BEST ANSWER: I have used the copper fungiside to treat Fireblight on a pear tree. I have seen no sign of it hurting birds that love to sit in the pear tree.
Can you use copper spray after the cherry tree has bloomed?
Cheryl D on Apr 19, 2016
You need to wait until the petals have fallen and the pollinators have stopped visiting the tree.
Then you will need to follow the directions carefully. Although copper is "organic" (it's really "inorganic", though) you still to be careful when handling it and spraying because it is toxic.

Customer Reviews

4.5 / 5.0
6 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
1st time user of this product
This is the first time for me using this product. It's capability seemed to match my problems completely. I was having a problem with my golden delicious apple tree. In a short time I can see much improvement and I would recommend this product to anyone for the proper application. Everything I have bought from Stark Bros. including apple trees have been excellent.
Dick Shelp
New Castle Va.
August 8, 2017
over 3 years ago
Bonide Copper Fungicide
Perfect product it worked like magic with one spray
June 2, 2016
over 5 years ago
Works Good
Plants love it, works good on every plant I have used it on. Clears up whatever is ailing it, and then the plant seems to be healthier than ever. Just wished it was not So expensive.
May 5, 2019
over 5 years ago
It works supper good I have used it on four trees three times will use it more this summer buy it it works very good
January 19, 2017
over 5 years ago
Super effective
My peach tree had shot hole disease last year, caused most of leaves fell before peaches ripe. This year the peach tree exhibit the disease again in June. I bought this fungicide and applied just once and see a significant improvement, it stopped the fungi to spread right away. And then I applied two more times, now there are no more shot holes on the peach tree leaves. I expect a good harvest in fall. Thank you Starbros for providing this great product. For all the products I bought from Starbros they are better than any other brand. I will keep shopping from Starbros in the future.
July 18, 2020
Apples: Silver Tip only
By the time I ordered and got it, I'd missed the window for apple application (silver tip until green tip reaches a half inch, according to the instructions). I'll keep it and use it next year.
June 27, 2018
over 2 years ago