Optic Foliar Evios - Odour-Free Foliar Spray for Thrips, Aphids and Spider Mites
Best for: growers dealing with thrips, aphids or spider mites who want a no-odour, non-oil spray they can still use late into flower.
Our thoughts
Evios is one we keep coming back to because it does the boring but important thing well: it kills the common three (thrips, aphids, spider mites) without leaving a smell or residue behind on your buds. No oils, no synthetic pesticide, and you can spray it with the lights on. It's not a miracle cure for a full-blown infestation, but as a regular preventative in the rotation it's hard to fault.
Optic Foliar Evios is a plant-extract based foliar spray made by Canadian brand Optic Foliar, designed to control common grow room pests without the oils, synthetic pesticides or lingering smell that come with a lot of older-style sprays. It's a non-oil, water-mixable concentrate — you dilute it and spray it directly onto the tops of your plants' leaves, and because there's no oil film, it doesn't need to hit the undersides of leaves to work.
The formula is built around non-traditional plant extracts rather than conventional active ingredients, which is why Optic Foliar market it as safe to apply with lights on and right through late flower — a stage where most oil-based sprays (neem, pyrethrin-based products) are off the table because they can taint smell and taste. Growers House stocks the 60ml bottle, a size built for topping up a small tent or getting through a short outbreak without buying a litre you won't use in time.
How it compares
Evios sits in the "clean, no-residue" corner of pest control, alongside a small group of plant-derived sprays rather than the traditional oil-and-pesticide aisle.
- Vs SNS-209 (Sierra Natural Science): SNS-209 is systemic and stays in the plant's tissue for weeks, giving longer protection, but Evios is non-oil and marketed as safe right up to late flower, where some systemic products carry more caution around harvest timing.
- Vs PureCrop1: PureCrop1 doubles as an insecticide, fungicide and biostimulant using a micelle-based mode of action, which makes it more of an all-rounder; Evios is more tightly focused on knocking down thrips, aphids and spider mites specifically.
- Vs neem oil and pyrethrin sprays: both are effective but leave an oily residue and a smell, and generally aren't recommended in late flower — Evios's whole selling point is that it avoids both of those trade-offs.
If you want a spray you can use without pausing lights, worrying about smell in the tent, or timing it carefully around harvest, Evios is built for exactly that gap.
Usage guidance
Evios is mixed with water and sprayed on as a foliar application — simple, but worth doing properly.
Mixing
Optic Foliar's own dosage is 10ml of Evios per litre of water (40ml per gallon). It's often paired with Optic Foliar's Transport delivery agent (7.5ml per litre) to help it penetrate the leaf surface, though Evios works as a standalone spray if you don't have Transport to hand.
Applying
Turn fans off before spraying so the mist settles rather than blows away, then spray the tops of the plant thoroughly — you don't need to chase the undersides of leaves. No need to pH the mixed solution.
Timing
Reapply weekly, or more often if you're actively fighting an outbreak rather than just preventing one. Safe to use with lights on, including in late flower.
Storage
Mixed solution can be stored long-term in a cool, dark place away from heat and light. Basic PPE (gloves, eye protection) is a sensible precaution if you're sensitive to sprays generally.
Technical specifications
- Type: Non-oil, plant-extract based foliar spray concentrate
- Manufacturer: Optic Foliar (Canada)
- Targets: Thrips, aphids, spider mites and other common grow room pests
- Mixing ratio: 10ml per litre of water (40ml per gallon)
- Companion product: Optic Foliar Transport (foliar delivery agent), used at 7.5ml per litre
- Application method: Foliar spray, tops of plant only
- Bottle size (this listing): 60ml — also sold by Optic Foliar in 250ml, 500ml and larger sizes
- pH adjustment required: None
- Late flower safe: Yes, per manufacturer guidance
Who this is for
- Growers spotting the first signs of thrips, aphids or spider mites and wanting to jump on it early
- Anyone in late flower who can't risk an oily or strong-smelling spray near harvest
- Budget and new growers who want a straightforward, dilute-and-spray IPM product without a complicated regime
- Small tent growers who only need a small bottle rather than committing to a litre
Best suited to regular preventative spraying or catching an outbreak early — for a heavy, established infestation, pair it with wider pest management rather than relying on it alone.
Our take
Evios does a specific job cleanly: knock down the pests growers see most often, without the smell, residue or lights-off faff that comes with older-style sprays. That's exactly the kind of "does what it says" product that earns repeat custom.
At this size and price it's a low-risk way to add a clean foliar spray to your pest control kit. One we sell a lot of for new growers who want something simple that works.
