The best rose fungicides, compared.
Top pick: RoseClear 3 in 1, 2 × 800 ml Best value: Toprose Fungus Control and Protect, 1 L – About £8.52 with 4.4 from 1,935 reviews, model 86600038, and the same disease list and three-week bullet, below the Provanto twin in this snapshot. Updated October 2026.
A rose fungicide on amazon.co.uk is a ready-to-use spray, a concentrate, or a mixable powder aimed at black spot, powdery mildew, or rust. This shelf mixes authorised plant protection products, pesticide-free plant-health sprays, and third-party bundles. Toprose Control and (model 86600038) and (model 86600250) match manufacturer records for tebuconazole plus trifloxystrobin. The amazon titles do not print those names. The Royal Horticultural Society does not recommend routine fungicides, and fallen leaves carry black spot into the next season. Black spots with leaf drop, white powder, and orange pustules are different problems. Greenfly on clean leaves is an insect job. How to choose is in the [rose fungicide buying guide](/hub/plant-accessories/rose-fungicide/sub/rose-fungicide-buying-guide). An authorised amateur pesticide has a number you can check on the HSE garden database. Do not describe it as the same control.
A rose fungicide on amazon.co.uk is a ready-to-use spray, a concentrate, or a mixable powder aimed at black spot, powdery mildew, or rust.
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Personal buying guide
Question 1 of 2
What is on the leaves?
RoseClear 3 in 1 in this set is two 800 ml ready-to-use sprays at £10.98, and the listing names fatty acid and sulphur, plus aphids, black spot, powdery mildew and rust. The customer-reviews line is 4.8 from 7. The saved listing contains two short UK reviews, both positive, with no fault described. The interval cell says further infestation and gives no day count, so a 7–10 day line from another retailer’s label does not belong on this row. It does not describe a concentrate. Seven reviews are not a reason to place it above sprays with thousands of ratings, even though the actives are printed. Model 119980 is the ready-to-use pack of two.
Pros
Cons
Best for: Aphids and a named fungus together, if you will take the interval from the bottle rather than from this row
Less suitable: Anyone choosing on star rating alone, or a fungus-only job where you want a large review sample
Specifications
Common questions
What active ingredients does the listing name?
Fatty acid and sulphur. The bullets also say it kills aphids, larvae and adults, and controls black spot, powdery mildew and rust.
How many reviews are on the listing?
The customer-reviews line is 4.8 from 7. The saved listing contains two short UK reviews, both positive, with no fault described.
Is this the same as a concentrate Ultra bottle?
The listing is a ready-to-use pack of two 800 ml sprays, model 119980. It does not describe a concentrate.
The Provanto Fungus Fighter Plus row is two ready-to-use litres at £16, and the bullets name black spot, powdery mildew, white rust, leaf spot and box blight, with contact and systemic cover for up to 3 weeks. Across 6,900 amazon.co.uk reviews the star line is 4.4, and the listing sits at rank 1 in Garden Fungicides. The title still says 1 L while the volume field is 2 litres and the unit count is 2, so you are buying a twin. A review says tomatoes were not on the approved list and the spray scorched them; the listing only says select edibles and does not print a crop table. Indoors, a review describes a dark purple-brown spray that drips on houseplant leaves. It is the top pick in this set because it is the largest review sample on a spray that names those rose diseases. One litre is the cheaper buy if a single bush is all you have, and you should skip this pack if the plant is not on the label.
Pros
Cons
Best for: A garden with more than one rose, or box blight as well, if you will follow the label and want the 6,900-review sample
Less suitable: One bush where a single litre is enough, or any edible the label does not list
Specifications
Common questions
Is this a single litre?
The title says 1 L and the pack note says the details apply to each unit. The volume field is 2 litres and the unit count is 2, so the listing is a pack of two.
Can it go on every edible?
The bullet says select edibles. A review says tomatoes were not on the approved list and the spray scorched the plants. The listing does not print a crop table.
What do reviewers say about indoor use?
The bullet includes houseplants. A review says the spray is dark purple-brown and drips on indoor leaves.
The Toprose Fungus Control and Protect trigger is a 1 L ready-to-use spray at £8.52, model 86600038, and the bullets name black spot, powdery mildew, white rust and leaf spot for up to 3 weeks. Across 1,935 amazon.co.uk reviews the star line is 4.4. Among 50 UK reviews a repeated point is that it sprays on clear and does not leave white marks. The same sample says black spot can return and needs another application, so the three-week line is not a one-spray finish. The suitable-for bullet includes the garden, conservatory, greenhouse and home, and it does not name a pet interval. It is the best value here when one litre of that disease list is enough. The £17.04 twin is the same model twice, and this listing does not name box blight or select edibles the way the Provanto bullets do.
Pros
Cons
Best for: One rose bush, or a short row, when you want a named disease list and a litre under £9
Less suitable: Anyone who wants the 6,900-review sample, or box blight and select edibles named on the Provanto bullets
Specifications
Common questions
Which rose diseases does the listing name?
The bullets name blackspot, powdery mildew, white rust and leaf spot, and say the formula is contact and systemic with protection for up to 3 weeks.
Does the listing say it can be used indoors?
The suitable-for bullet includes the garden, conservatory, greenhouse and home. It does not name a pet interval.
Do the reviews mention a white residue?
Among 50 UK reviews, a repeated praise is that it sprays on clear and does not leave white marks. A separate complaint is that black spot can return and needs another application.
Ecofective Rose Defender is a 1 L ready-to-use spray at £4.99, and the specification target is insects. No disease is named in the bullets, and no active ingredient is in the saved listing. Across 415 amazon.co.uk reviews the star line is 4.3. Of 35 UK reviews, many are about greenfly, split between a quick kill and no effect after a whole bottle. A minority mention mildew, rust or a fungal infection. Reviews also say the bottle they received had no contents list. It is ranked in Garden Fungicides, which does not turn the listing into a black-spot spray. The country of origin is given as the United Kingdom.
Pros
Cons
Best for: Greenfly on roses, if you read the bottle you receive and do not need a named fungus
Less suitable: Black spot, mildew or rust, where the listing never names the disease
Specifications
Common questions
Does the listing name a fungus?
No. The target-species field says insects, and the bullets are only the product name. It is ranked in Garden Fungicides.
What do the reviews actually report?
Of 35 UK reviews, many are about greenfly, with a split between a quick kill and no effect after a whole bottle. A minority mention mildew, rust or a fungal infection.
Is the formula printed on the listing?
No active ingredient is in the saved listing. Reviews say the bottle they received had no contents list.
Topline Clear Bug is two 800 ml ready-to-use bottles at £16.99, and the bullets call it a 3-in-1 insecticide and fungicide for aphids, whiteflies, black spot, rust and powdery mildew. Across 82 amazon.co.uk reviews the star line is 4.3. Several of the 16 UK reviews say a white deposit stays on the leaves after rain. Others say black spot or greenfly was reduced. The specification table does not give a bee time. One review says the bottle itself said to spray before 9am and after 7pm. There is no systemic claim and no day-count interval on the listing. You are close to the Provanto twin’s price, with a much smaller sample and a residue complaint.
Pros
Cons
Best for: Roses that have both greenfly and a fungus the bullets name, if you can accept a white film
Less suitable: A fungus-only job, or anyone who wants a clear spray and a review count in the thousands
Specifications
Common questions
Does it claim to treat fungus and insects?
Yes. The bullets say a 3-in-1 insecticide and fungicide for aphids, whiteflies, black spot, rust and powdery mildew.
Why do some reviews mention white leaves?
Several of the 16 UK reviews say a white deposit stays on the leaves after rain. Others say black spot or greenfly was reduced.
Does the listing give a bee time?
Not in the specification table. One review says the bottle itself said to spray before 9am and after 7pm.
The Topline Rose Clear Ultra bundle is a 200 ml 3-in-1 concentrate plus a 1 L sprayer and a Topline card, at £18.99. The bullets claim black spot, rust, powdery mildew, aphids and whiteflies. Across 29 amazon.co.uk reviews the star line is 4.3, and the display sample is six UK reviews. One of those says the pack arrived with no instructions. Another says greenfly remained and black spot started after the stated dose, evening spraying and shaking. The specification table does not list a leaflet. This is not the ready-to-use RoseClear 3-in-1 twin in this set. The review sample is too thin to treat the 4.3 as a settled result.
Pros
Cons
Best for: Someone who already mixes concentrates and has checked the dilution on the bottle they receive
Less suitable: A first spray, or anyone who wants a ready-to-use trigger and a larger review sample
Specifications
Common questions
What is in the pack?
The listing describes a 200 ml 3-in-1 rose concentrate, a 1 L multi-purpose sprayer and a Topline card. The volume field is 200 ml.
Are instructions included?
The specification table does not list a leaflet. One of six UK reviews says the pack arrived with no instructions.
Did reviewers see black spot stop?
One review says greenfly remained and black spot started after the stated dose, evening spraying and shaking. The other reviews are short delivery notes.
Westland Fungus Guard is an 800 ml ready-to-use spray at £5.90 whose bullets say pesticide-free, biodegradable and non-toxic, and that it removes disease spores. They do not name black spot, powdery mildew or rust, and they give no repeat interval. Across 458 amazon.co.uk reviews the star line is 4.2. In 50 UK reviews the sprayer is a repeated fault: it stops, especially near the end of the bottle, and people decant it. Others say it did nothing for mildew or black spot. The specification table has no pet or harvest interval. Non-toxic is a bullet, and a harvest-until-picking comment appears only in a review. At this price it is a plant-health wash, not a rose spray with a named disease.
Pros
Cons
Best for: A gardener who will not buy a pesticide and accepts a spore-wash claim with no named rose disease
Less suitable: Black spot, mildew or rust that you need the label to name, or anyone who wants a trigger that lasts to the last of the bottle
Specifications
Common questions
Does the listing name black spot?
No. The bullets say it removes disease spores, builds disease resistance and gives a leaf wash. They also say it is pesticide-free.
What fails in the reviews?
In 50 UK reviews the sprayer is a repeated fault: it stops, especially near the end of the bottle, and people decant it. Others say it did nothing for mildew or black spot.
Is there a pet or harvest interval in the spec table?
No. The bullets say non-toxic. A harvest-until-picking comment appears in a review, not in the specification fields.
Tricho Protect is two 200 g pouches at £41.78, and the listing names Trichoderma harzianum at 2 × 10^6 CFU per gram. The title says each 200 g makes 20 L of spray and recommends it for black spot on roses. The bullets also name root rot, damping off, wilt and fruit rot, and they do not name rust. Across 363 amazon.co.uk reviews the star line is 4.2. In the 50 UK reviews, several say the powder arrived in an unmarked black pouch with no dose or precautions. Others say weekly use reduced black spot. A review says it had little effect on rust. You are mixing a biological powder, not pulling a ready-to-use trigger. At this price the missing label on the pouch is the reason to pause.
Pros
Cons
Best for: Someone who will mix a biological powder for black spot and can confirm the dose on what arrives
Less suitable: A ready-to-use rose spray, or rust, which this listing does not name
Specifications
Common questions
What organism does the listing name?
Trichoderma harzianum at 2 × 10^6 CFU per gram. The title says each 200 g makes 20 L of spray and recommends it for black spot on roses.
Do the reviews mention labelling?
Yes. In the 50 UK reviews, several say the powder arrived in an unmarked black pouch with no dose or precautions. Others say weekly use reduced black spot.
Does the listing name rust?
No. A review says it had little effect on rust. The bullets name black spot, root rot, damping off, wilt and fruit rot.
This Toprose listing is two 1 L triggers at £17.04, model 86600038, the same number as the single litre. The disease bullets match: black spot, powdery mildew, white rust and leaf spot, contact and systemic, up to 3 weeks, used at the first sign of infection. The listing line is 4.0 from 1 review, and the saved listing has no review text. You pay £17.04 for a second bottle of a spray already sold here at £8.52 with 1,935 reviews on the single. The suitable-for line still includes home, conservatory and greenhouse, with no pet interval. A one-review twin is not a separate formula and not a second opinion. Buy the single unless you already know you will use two litres.
Pros
Cons
Best for: Someone who has already used the 1 L and wants a second bottle of model 86600038 on one order
Less suitable: A first purchase, where the 1 L listing has 1,935 reviews and costs £8.52
Specifications
Common questions
Is this a different formula from the 1 L Toprose?
The model number is 86600038, the same as the 1 L listing, and the disease bullets match. This ASIN is the pack of two.
How many reviews are on this pack?
The listing line is 4.0 from 1 review. The saved listing has no review text.
What interval does the bullet claim?
Up to 3 weeks, from a contact and systemic formula, used at the first sign of infection.
Vitax Rosegarde is a 750 ml spray at £14.17 whose title says combined insecticide and fungicide for roses. The listing does not name an active or a disease, and the target-species field says insects. Across 18 amazon.co.uk reviews the star line is 3.9. One review says a fungus was gone within two weeks and the rose bloomed. Another says it keeps plants free from bugs. One reviewer read the label and binned it as unsuitable around children, pets and bees. That concern is in a review of the label, not in the specification table. At £14.17 you are buying a short sample and a blank disease list. The saved listing is not a basis for guessing what is in the bottle.
Pros
Cons
Best for: Only if you have the bottle in hand and the label names the pest or disease you actually have
Less suitable: Buying from this listing alone, where black spot, mildew and rust are not named
Specifications
Common questions
Which diseases does the listing name?
None. The title says combined insecticide and fungicide for roses. The target-species field says insects. No active ingredient is printed.
What do the reviews say?
One says a fungus was gone within two weeks and the rose bloomed. Another says it keeps plants free from bugs. One reviewer read the label and binned it as unsuitable around children, pets and bees.
Is there a pet claim in the specification table?
No. The pet concern is in a review of the label, not in a bullet.
Provanto Natural Feed and Defend is a 1 L ready-to-use spray at £6.95. The target species is fungus. Powdery mildew, rust and edible crops appear in a keyword line, not in a structured bullet list, and no active ingredient is named. Across 33 amazon.co.uk reviews the star line is 3.8. Of the four reviews in the saved listing, two say it is doing the job, one has not yet seen an avocado improve, and one says the bottle was a year out of date. There is no interval and no black-spot line in the specification table. It is a low-priced plant-defence spray with a thin, mixed sample. It is not the Fungus Fighter Plus twin, which names the rose diseases in the bullets.
Pros
Cons
Best for: A fungus wash under £7, if you check the date on the bottle and do not need black spot on the label
Less suitable: Black spot, or anyone who wants a numbered interval and a named active
Specifications
Common questions
Which diseases are in the specification table?
The target species is fungus. Powdery mildew, rust and edible crops appear in a keyword line, not in a structured bullet list.
What do the four reviews say?
Two say it is doing the job. One has not yet seen an avocado improve. One says the bottle was a year out of date.
Is an active ingredient named?
No. The saved listing does not name a chemical or a biological active.
Rose Guard Natural is two 800 ml pesticide-free triggers at £19.99. The bullets name powdery mildew, aphids, whitefly and spider mites, and say shake and spray both leaf surfaces, reapplying every 7 days or before problems start. Black spot and rust are not named. The listing line is 3.0 from 1 review, and the saved listing has no review text. The bullets say bee and wildlife friendly when used as directed, and safe around children and pets. That is a listing claim, not a test. At £19.99 for a one-review sample it is a dear way to buy a mildew-only spray with a 7-day repeat. The indoor line is yes, which the cheaper pesticide-free bottle in this set does not state.
Pros
Cons
Best for: Powdery mildew on roses, indoors or out, if you refuse a pesticide and will respray every 7 days
Less suitable: Black spot or rust, or anyone who wants more than a single review before paying £19.99
Specifications
Common questions
Do you have to mix it?
No. The bullet says shake and spray both leaf surfaces. It is a pack of two 800 ml triggers.
Which fungus is named?
Powdery mildew, with reapplication every 7 days or use before problems start. Black spot and rust are not named.
What is the review sample?
The listing line is 3.0 from 1 review. The saved listing has no review text. The bullets say bee and wildlife friendly when used as directed, and safe around children and pets.
Twelve rose-fungicide listings on amazon.co.uk were scored on 16 October 2026. The editorial score is not the star rating times 20. Stars contribute up to 15 points, review volume up to 40, the disease listing up to 30, and price fit up to 15. Points come off for scorch on an unlisted crop, a sprayer that stops, an unmarked pouch, a white deposit, a review with no text, or a bottle a year out of date. There was no garden trial. A 4.8 from seven reviews does not lead the table. Twin packs that repeat one formula are not treated as a second product.
Review stars
15%Round half up: Amazon stars divided by 5, then times 15. No star line scores 0. The star line is the amazon.co.uk figure, not a laboratory rating.
Review volume
40%5,000 or more reviews score 40; 1,000 or more score 30; 300 or more score 20; 50 or more score 12; 20 or more score 7; 8 or more score 4; 2–7 score 2; one review scores 0.
Listing for rose fungus
30%Black spot in the disease bullets scores 10. Powdery mildew or rust in those bullets scores 8. A numbered interval scores 6. A systemic claim on the listing scores 6. A keyword line only, with no disease bullet, scores 4 and nothing else.
Price fit
15%Compared only inside the same type of spray. A ready-to-use litre under £9 that names black spot scores 15. The £16 twin with thousands of reviews scores 12. A pesticide-free bottle under £7 scores 8. A blank disease list or a one-review twin scores 5 or less. The £41.78 powder scores 2.
Name the symptom, then the legal type, then the review sample. A pesticide-free bottle, a systemic ready-to-use spray, and a mixable powder are not the same purchase. The notes below follow that order for these twelve listings.
A rose fungicide on this shelf is a ready-to-use spray, a concentrate, or a mixable powder aimed at black spot, powdery mildew, or rust. Authorised plant protection products, pesticide-free plant-health sprays, and third-party bundles are not interchangeable. An authorised amateur pesticide has a MAPP number you can check on the HSE garden database. A pesticide-free spray, such as Westland Fungus Guard, is a plant-health product on its own safety sheet. Do not describe it as the same control.
Black spots with yellowing and leaf drop are black spot. White powder on young growth is mildew. Orange pustules under the leaf are rust. Greenfly on otherwise clean leaves is an insect job, not a fungicide job.
Westland Fungus Guard is a plant-health product. Its bullets do not name black spot. A MAPP number on an authorised amateur product is a different legal type. Pesticide-free does not mean it is that product.
The systemic bullets say up to three weeks. Reviewers say black spot can return. Spotted leaves do not turn green. Fallen leaves carry the disease into the next season. A white deposit that rain does not remove is a reason to stop.
Name the symptom before you compare prices. Black spot, powdery mildew and rust are different patterns, and greenfly is not a fungus. Then match the legal type. An authorised amateur pesticide has a MAPP number on the HSE garden database. Fungus Control and Protect is MAPP 18223. RoseClear Ultra is MAPP 14854, which is not the fatty-acid 3-in-1. A pesticide-free spray stays in its own class. Format is the next split. Most rows here are ready-to-use triggers.
Judge the review sample before the star. Provanto Fungus Fighter Plus is 4.4 from 6,900 reviews at about £16 for 2 × 1 L. Toprose 1 L is 4.4 from 1,935 at about £8.52. A 4.8 from seven reviews, and a 4.0 from one review on the Toprose twin, are thin samples. The twin repeats model 86600038. It is not a second formula. Reject blank or expired stock. Tricho Protect reviews describe unmarked pouches. One Provanto Natural review says the bottle was a year out of date.
Three typical situations, each with a recommendation from this comparison.
You will accept an authorised pesticide and you want a disease list plus a large amazon.co.uk sample. Provanto Fungus Fighter Plus is 4.4 from 6,900 reviews at about £16 for 2 × 1 L, and the bullets name black spot. Skip it if the plant is not on the label. One review reports tomato scorch.
You want a pesticide-free bottle and you will accept a weaker, shorter-interval claim. Westland Fungus Guard is about £5.90 for 800 ml, 4.2 from 458 reviews. The bullets do not name black spot, mildew or rust. Reviews include a sprayer that stops and reports of no effect.
A 3-in-1 listing names insects and a fungus, and you inherit residue and bee constraints. RoseClear 3 in 1 names fatty acid and sulphur, plus aphids, black spot, mildew and rust, at about £10.98 for 2 × 800 ml. The star line is 4.8 from only 7 reviews, with no day count on the listing.
In this set of twelve amazon.co.uk listings, the top pick is Provanto Fungus Fighter Plus, 2 × 1 L, at about £16. It shows 4.4 from 6,900 reviews, rank 1 in Garden Fungicides, and the bullets name black spot, powdery mildew, white rust, leaf spot and box blight, contact and systemic, for up to 3 weeks. A review says tomatoes were not on the approved list and the spray scorched them. The title says 1 L; the pack is two. The best value is Toprose Fungus Control and Protect, 1 L, at about £8.52, model 86600038, with 4.4 from 1,935 reviews and the same disease list and three-week bullet, without box blight or select edibles. Westland at about £5.90 is cheaper and is not that award: its bullets do not name black spot. Reviewers say black spot can return. None of these rows is a garden trial.
Toprose Fungus Control and Protect, 1 L
About £8.52 with 4.4 from 1,935 reviews, model 86600038, and the same disease list and three-week bullet, below the Provanto twin in this snapshot.
Editorial
Products Compared publishes British-English buying guides based on amazon.co.uk listings and public UK sources. We do not run a lab and we do not invent test scores.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources checked for this comparison, plus the amazon.co.uk listing facts in the display file on 16 October 2026. Shelf prices and star lines are those UK figures. HSE and RHS pages are the legal and hygiene frame. They are not a ranking of these twelve bottles.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the UK listings checked on 16 October 2026. We did not run a garden trial or a laboratory test on these sprays.
