Lawn & garden
Doff Rose & Shrub Shield Bug & Fungus Killer dupe
Why pay around £5.50 for Doff? The bulk active is Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm) — 85% less per working litre than a typical shelf pack.
From the retail pack to the active and the mix
1 · Retail
Doff Rose & Shrub Shield Bug & Fungus Killer
1 litre · £5.50 typical snapshot
Water, emulsifiers and a labelled myclobutanil dose
2 · Active
Cypermethrin (with myclobutanil)
0.005% on the label
52315-07-8C22H19Cl2NO3
Bulk Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm)
3 · Mix
10 ml of 5 g/L made up to 1 L (≈0.05 g/L — Rose Shield RTU)
£0.52 per working litre · 85% less than the shelf pack
- Active
- Cypermethrin (with myclobutanil)
- CAS
- 52315-07-8
- Dupe
- Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm)
- Saving
- 85% / L
Saving is per litre of working-strength mix versus a typical pack price, not versus the DIY kit total. Shop prices move — always check the listing.
Label teardown
What the pack promises versus what the label chemistry actually is.
The marketing claim
“Combined insecticide and fungicide for roses”
The chemical reality
Doff Rose Shield RTU is cypermethrin at 0.05 g/L plus myclobutanil at 0.075 g/L — a pyrethroid and a triazole in one trigger. Cypermethrin (CAS 52315-07-8) is not permethrin ant dust and not Provanto deltamethrin. The fungus half is the Rose Clear molecule. Dilute a householder-labelled cypermethrin concentrate to 50 ppm for the bug job.
Active vs filler
0.005% Cypermethrin (with myclobutanil) · 100% carrier / filler — Water, emulsifiers and a labelled myclobutanil dose
- Typical retail
- £5.50
- 1 litre
- Estimated active cost
- £0.52
- Scaled from bulk £12.99 / 250 millilitres
- Indicative markup
- 10.6×
- Snapshot maths, not a live shop price
The Marketing Claim & The Catch
A 1 litre pack of Doff Rose & Shrub Shield Bug & Fungus Killer typically retails around £5.50 in lawn & garden. That is a UK shelf-price snapshot for the maths on this page — not a live shop quote or a manufacturer RRP. Listings, sizes and deals move. The marketing line is that you are buying a finished lifestyle product, not a weighed chemical.
On the pack: Combined insecticide and fungicide for roses; Kills aphids and helps control rust and blackspot; and Ready-to-use 1 litre trigger.
The catch: Doff Rose Shield RTU is cypermethrin at 0.05 g/L plus myclobutanil at 0.075 g/L — a pyrethroid and a triazole in one trigger. Cypermethrin (CAS 52315-07-8) is not permethrin ant dust and not Provanto deltamethrin. The fungus half is the Rose Clear molecule. Dilute a householder-labelled cypermethrin concentrate to 50 ppm for the bug job.
- “Combined insecticide and fungicide for roses”
- “Kills aphids and helps control rust and blackspot”
- “Ready-to-use 1 litre trigger”
Proprietary Blend & Dosage Breakdown
The labelled active is Cypermethrin (with myclobutanil) at 0.005%. Everything else in the pack is water, emulsifiers and a labelled myclobutanil dose.
At 0.005% active, most of what you pay for is carrier and packaging. The brand is selling convenience, fragrance and a label — not a uniquely potent molecule.
Branded working strength is whatever comes out of the bottle. The bulk alternative is 0.5% Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm), mixed to 10 ml of 5 g/L made up to 1 L (≈0.05 g/L — Rose Shield RTU).
- Labelled active
- Cypermethrin (with myclobutanil)
- 0.005%
- Carrier
- Water, emulsifiers and a labelled myclobutanil dose
- Retail pack
- 1 litre · £5.50
The Active Chemical Alternative (Dupe Stack)
The dupe stack is Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm) at 0.5% bulk. Indexed as CAS 52315-07-8, formula C22H19Cl2NO3. Buy it as 250 millilitres for around £12.99 from Amazon UK.
Working strength: 10 ml of 5 g/L made up to 1 L (≈0.05 g/L — Rose Shield RTU). Indicative cost £0.52 per diluted litre — 85% below a typical branded pack on a per-litre basis, before you reuse leftover bulk.
Follow the mixing method and the supplier SDS. Wear the listed PPE. Do not mix incompatible oxidisers, acids or ammonia.
- Pesticide: very toxic to aquatic life and bees when spray is wet. Read the MAPP label on the pack you buy. Gloves, goggles. Spray at dusk if bees are foraging; keep off ponds and water butts.
- Measure 10 ml of a householder-labelled 5 g/L cypermethrin emulsion into a litre of water (1:99). That is about 50 ppm — the Rose Shield RTU insecticide band.
- Spray both leaf faces until glistening. 1 litre treats about 10–20 m² of rose. Keep pets off until dry. Do not apply when bees are actively foraging.
- 250 ml of 5 g/L at 10 ml/L makes 25 litres of RTU-strength spray — twenty-five 1 L triggers. This mix is the cypermethrin half only.
- For blackspot, use the Rose Clear myclobutanil teardown — do not invent a two-active tank mix from agricultural 10% EC. Triple-rinse the sprayer.
Dilution recipe
1 L working batch
Working strength 10 ml of 5 g/L made up to 1 L (≈0.05 g/L — Rose Shield RTU). Educational estimate from the listed ratio — check the SDS before you mix.
Chemical
10 millilitres
Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm)
Water
0.99 litres
Carrier / diluent
1% concentrate · 99% water by working volume (solids are dissolved into the water share).
Required PPE
Loading calculator…
Side-by-Side Price & Potency Comparison
Head-to-head comparison
| Measure | Retail brandedDoff | Raw active dupeDupeStack |
|---|---|---|
| Product | Rose & Shrub Shield Bug & Fungus KillerAmazon UK search — listing, not a confirmed seller | Cypermethrin 5 g/L amateur emulsion (diluted to 50 ppm) |
| Pack / unit | 1 litre · £5.50 | 250 millilitres · £12.99 |
| Active | Cypermethrin (with myclobutanil) at 0.005%Carrier: Water, emulsifiers and a labelled myclobutanil dose | 0.5% bulkC22H19Cl2NO3 |
| CAS number | Not disclosed on pack | 52315-07-8 |
| Working strength | Ready-to-use pack | Dilute 10 ml of 5 g/L made up to 1 L (≈0.05 g/L — Rose Shield RTU) |
| Cost per litre | £5.50 / L typical pack | £0.52 / L mixed from bulk |
| Headline saving | Baseline | 85% cheaper |
| COSHH / PPE | Follow the branded SDS | Gloves. Chemical-resistant gloves (nitrile or neoprene)Eye protection. Indirect-vent splash goggles — not ordinary spectaclesVentilation. Use outdoors or with mechanical extraction |
Active ingredient and cheaper alternative — FAQ
Is this the same as Provanto Ultimate Bug Killer?
Same broad family (pyrethroid foliar sprays) but different molecules. Provanto is deltamethrin (CAS 52918-63-5). Rose Shield’s insecticide is cypermethrin (CAS 52315-07-8) at 50 ppm in the trigger. Different HSE numbers — do not swap dilutions.
Is the fungus half the same as Rose Clear Ultra?
Yes on the triazole: both use myclobutanil (CAS 88671-89-0). Rose Clear Ultra concentrate is about 0.875 g/L before you dilute; Rose Shield RTU is already 0.075 g/L. See the Rose Clear teardown for weighed technical powder — do not stack two myclobutanil sprays in one tank.
How do you mix the Rose & Shrub Shield Bug & Fungus Killer dupe stack?
Pesticide: very toxic to aquatic life and bees when spray is wet. Read the MAPP label on the pack you buy. Gloves, goggles. Spray at dusk if bees are foraging; keep off ponds and water butts. Measure 10 ml of a householder-labelled 5 g/L cypermethrin emulsion into a litre of water (1:99). That is about 50 ppm — the Rose Shield RTU insecticide band. Spray both leaf faces until glistening. 1 litre treats about 10–20 m² of rose. Keep pets off until dry. Do not apply when bees are actively foraging. 250 ml of 5 g/L at 10 ml/L makes 25 litres of RTU-strength spray — twenty-five 1 L triggers. This mix is the cypermethrin half only. For blackspot, use the Rose Clear myclobutanil teardown — do not invent a two-active tank mix from agricultural 10% EC. Triple-rinse the sprayer.
DupeStack provides chemical concentration data and educational mixing guides only. Wellness pages compare food supplements, not medicines or prescribed treatments. Always review the supplier Safety Data Sheet (SDS) and comply with UK Health and Safety Executive (HSE) and COSHH regulations when handling concentrated substances. Mixing and storage are at your own risk. Some links are affiliate advertisements (Amazon Associates, eBay Partner Network, and Awin when those programmes are live). Commissions do not change listed concentrations or calculator output.
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Indicative DIY stack