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Bonide® Fung-onil™ Multi-Purpose Fungicide


Controls virtually every fungal disease. This fungicide will help manage diseases like scab, brown rot, black spot, mildew, and rust. Use on many fruit trees, vegetables, flowers, shrubs and more. Follow product label and apply as directed.

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Browse 44 questions Browse 44 questions and 69 answers
Why did you choose this?
Stark Bro's Store
we have had a fungus problem last 2 years with our apples so I am going to give this a try.
Robin G on May 15, 2020
Sick trees ????
Nancy S on Apr 5, 2020
we have had a fungus problem last 2 years with our apples so I am going to give this a try.
Robin G on May 15, 2020
Insurance in case we have another wet summer.
Eric K on Apr 17, 2020
Sick trees ????
Nancy S on Apr 5, 2020
cobi h on Sep 9, 2019
some of my plants are having fungus issues.
Jodie N on Sep 25, 2018
I have had apple trees before. I never knew how to care for them. They always had problems so I read what this product did. It seems to help with some of the problems I have had.
Ray M on Feb 15, 2017
For Tomato Blight
MARCUS W on Feb 15, 2017
Used it for my fruit trees. Excellent fungicide
Bobby O on Nov 5, 2016
Insurance in case we have another wet summer.
Eric K on Apr 17, 2020
cobi h on Sep 9, 2019
Will this help if the trees leaves are curled and have black spots?
Carmella W on Aug 6, 2016
BEST ANSWER: Thank you for your question. In order to help you, we need to know what kind of tree is having the problem you describe. Could you please supply that information?
How is this applied to the tree? What is the dilution ration? Will it control brown fruit rot on a nectarine tree in Alabama?
Jamie S on Mar 25, 2016
BEST ANSWER: It is a liquid concentrate that you will mix with water and put in a tank-type sprayer to make an application (either in the fall or the spring depending on your needs). It does control fungal issues like brown rot in nectarine trees, and the instructions recommend 3 ?? teaspoons per application. This and other specific-use information is included on the product label for your convenience.
Will this work on peach leaf curl?
Shawn V on Apr 22, 2019
BEST ANSWER: Hi Shawn. Yes the product works on leaf curl with fruit trees, the instructions indicate to apply at leaf fall in late autumn. When conditions favor high disease levels apply once or twice more in mid to late winter before budswell. Also be aware there is a warning about not applying 1 week before or after application of oil or oil based pesticide. Hope this is helpful.
Does this product work on apple rust?
artistfaith on Jun 1, 2016
BEST ANSWER: Fung-onil is not labeled for use on apple trees.
What Is application rate?
Donna B on Mar 28, 2020
BEST ANSWER: I followed the instructions on the bottle when mixing it in a sprayer.
I applied to the top/bottom of leaves on our cherry trees until leaves
had a few drops falling off. I also applied to the ground surrounding the trees.
Is this better than Captan on peach trees to control brown rot?
Russell P on Nov 2, 2019
BEST ANSWER: Hi Russell - We appreciate you reaching out to us. Fung-Onil is a good choice for treating brown rot on all stone fruits. If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Can this product be sprayed on a crepe myrtle tree with black sooty mold and aphids? Thanks.
Nancy M on Aug 29, 2018
BEST ANSWER: This is a fungicide, but is not multi-purpose (meaning it would also contain an insecticide). A good all-in-one product for your problem would be neem oil, which is organic and non-toxic to humans and pets. It will address both the sooty mold and the aphids. //
I have a peach tree that the leaves were deformed and discolored. The fruit grew however once it was about two weeks out from harvest all of the fruit turned rotten and fell off. It recently blossomed. What should I use on it?
CalBar on Mar 30, 2020
can I use this product on apple tree? thank you!
Helen G on May 5, 2020
BEST ANSWER: Yes ,I highly recomend to use on apple trees if is properly diagnosed that have fungal disease or diseases like skab or a leaf spot etc.It does work if applied in early stage of disease or as preventative.
Will this work on Tomato plans?
Edwin B on Jun 22, 2020
BEST ANSWER: You have not described the issue you're having with the tomato plants...
In some cases you can use a solution of Hydrogen Peroxide and water to fix tomato issue... check out YouTube.
Will this product work on fungus that affect conifers?
Jeff H on Oct 30, 2020
BEST ANSWER: We have used it on only fir and fruit trees, except for one conifer and they all have remained healthy. May I suggest you consider also a dormant spray as well. We will be doing that as soon as possibly next week. We are in the South, zone 8. Also due to factories being run sporadically, we bought more than a year???s worth, we never want ti be caught empty with our trees protection. We use All Seasons Bonide from Stark
Do you have to spray or can you apply to roots on big established trres?
Ken S on Jun 6, 2020
BEST ANSWER: I'm not sure if you're supposed to or not, but I spray the leaves, branches, trunk, and ground surrounding the tree each time I treat for fungus. My trees seem just fine after.
Will this work on grapes?
Rex C on Jun 12, 2019
BEST ANSWER: The label does not mention specific use for grapes, so we could not recommend it. Here is a link to the label: ????
Will this work on mildew in apple trees?
James B on Aug 9, 2018
BEST ANSWER: Actually, this is a better product for mildew issue on an apple tree. Here is a link to the label:

Bonide Fruit Tree Spray:

Here is a link to the product page:
How to dispose of it properly if left over?
Judy G on May 20, 2018
BEST ANSWER: Instructions for disposal, depending on whether or not there is any product remaining in the container, can be found on the label. //
can this be used for grapes, have a fungus on some kind, black spots on canes?
CHARLES G on Mar 20, 2018
BEST ANSWER: I have used this product on plum and cherry trees for black knot along with pruning.
Unfortunately, I have no experience on grape vines. Remember a few things that should carry over.
First, the fungus should be pruned off and go roughly eight inches away as it will travel through the plant. Second, do not compost the pruned material or leave it lying in a brush pile. Burn it up or haul it away. Third, your spores have to come from some place. Do an inventory around your property. Vines often grow from birds along fences or even under trees. If those vines have fungus, the fungus needs to be removed to eradicate the source of your fungus. In the spring and especially in a wet spring, the spores seem to spread more readily.
Will this fungicide prevent fire blight on pear trees?
james q on May 21, 2016
BEST ANSWER: No, fire blight is a bacterial disease. A high elemental copper spray during early spring through 1/2" green tip will help. You can also apply streptomycin during bloom.
How much do I mix to 2-gallons of water?
Shooter on Sep 12, 2020
BEST ANSWER: We appreciate you reaching out to us. I do not have a bottle here to give the measurements but it is listed on the product container. Follow product label and apply as directed.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Have a black fungus on my lemon trees as well as oak trees and red tip bush's.. What I can use to get rid of this?
Steve on Aug 9, 2020
BEST ANSWER: Sounds like you are dealing with Sooty mold. Sooty mold is a fungus, which causes the blackening of the leaves of citrus trees. The mold forms on the leaves as a result of honeydew secretions from insects such as whiteflies, aphids and mealybugs. ... To control and eliminate the mold growth that has already developed, spray the tree with Liquid Copper Fungicide.
Can i use this product on nut trees?
Cathy S on Oct 16, 2019
BEST ANSWER: Hi Cathy, According to the label you can use this product on nut trees. If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Can this be used on flowering crab trees for scab? Also, can I spray if the outside temperature is over 85 degrees?
sienna42 on Jul 3, 2019
BEST ANSWER: This would be a better product for this condition:

The label states that this product should not be used when the temperature is above 90.
Can I use fung-oil on apricot trees?
Christine on Jun 23, 2019
BEST ANSWER: Yes, you can. Here is a link to the label so you can see how much and how to apply it to apricot trees:
can fung-onil be sprayed on peaches in mid June?
Charles P on Jun 18, 2019
BEST ANSWER: It needs to be sprayed every 10-14 days up to 2 weeks before harvest. I had a very bad brown rot that did 100 % damage to my peaches. Check the university of Tennessee s spraying chart for spraying peaches in the South. They have the most info on it . I spray my trees in the evening when is not that hot and I add some sulfur to it also.
how long before its start to work after you spray ?
dirty harry on Jun 16, 2019
BEST ANSWER: It will begin to address the fungus problem immediately.
When I???m the spring should it b used?
Pat M on Jan 31, 2019
BEST ANSWER: That will depend upon what you're using it for. Here is a link to the label where you can see when to spray for what tree/plant: //
can this be used on blue spruce trees ?
charles s on Jun 12, 2018
BEST ANSWER: Yes, the label says it is for use on spruces. Here is a link to the label:

What's the shelf life of this product? How long can it sit in my garden shed and still be effective once opened?
Alison B on Dec 29, 2017
BEST ANSWER: If you have prolonged periods of freezing weather, the product will not perform as well after being frozen. If it's not frozen, it is shelf-stable for about 2 years. It's also advisable to keep it from being exposed to excessive heat.
does this treat anthracose(sp) on peonies ?
thomas f on Nov 13, 2017
BEST ANSWER: Yes, this is the perfect treatment for foliar anthracnose. You can read the label here: //
Will this work on black knot on plum trees?
Tamar A on Sep 11, 2017
BEST ANSWER: Bonide Fung-Onil will solve your problem. It specifically treats black knot on plums. Here is a link to that page: ://
Is this product pet friendly?
Andrea H on May 15, 2017
BEST ANSWER: I would say no. The label states not to allow people or pets to enter treated areas until sprays have dried or dusts have settled. It also states not to apply the product in a way that will contact other persons, or pets, either directly or through drift.

Customer Reviews

4.8 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Did a great job controlling blight in my tomato patch. Greatest thing since Copper Dragon
August 22, 2016
over 4 years ago
Excellent in Zone 8
Use it twice yearly, it helps tremendously on all our trees, as well as many bushes
October 31, 2020
1 year ago
It works good on apple trees burn the grapes a little
July 7, 2017
over 3 years ago
Great Product
Stark Brothers is a great supplier, shipped promptly, with no hassles.
March 1, 2017
over 4 years ago