See disease pressure before it shows.
Guard is a four-channel node and a set of disease-risk models running on our servers. It scores how favourable your greenhouse air has been for grey mould and four other diseases, and tells you when a scouting walk is worth it.
Four channels. One reading a minute.
Everything Guard reports starts from these readings. The models run on our servers, so they improve without anyone touching the node.
Air temperature and humidity
The dew point, and how close the air came to it, are calculated from these. The humidity sensor is specified to ±3 % RH, which is about ±0.5 °C on the dew point.
CO₂
Tells a closed house from one that is venting, so the models know which climate they are reading.
Air pressure
Shown beside the disease scores for context.
Leaf wetness, estimated
Estimated from air humidity and the dew-point margin, so one node covers what would otherwise take a second sensor on the leaf.
Five diseases, each modelled to the strength of its evidence.
Grey mould, powdery mildew and gummy stem blight each carry a risk score from 0 to 100. Downy mildew and white mould carry a flag that speaks up when their conditions line up.
| Disease | What Guard shows | What it reads |
|---|---|---|
| Grey mould (Botrytis) | Risk score, 0–100 | Long unbroken hours near saturation, weighted by temperature and measured against your own house's history. |
| Powdery mildew | Risk score, 0–100 | A wide daily swing in humidity, the pattern published research links to powdery mildew. |
| Gummy stem blight (Didymella), cucurbits | Risk score, 0–100 | Moisture on the stem through the night and into the morning, read from the dew-point margin as the house warms. |
| Downy mildew (Pseudoperonospora cubensis), cucurbits | A three-state flag, switched on once the disease is confirmed in your region | Two hours of leaf wetness with spores arriving from outside, so the flag speaks up only when both line up. |
| White mould (Sclerotinia) | A three-state flag for houses with a history of white mould | Cool, humid spells in houses where sclerotia survive in the substrate. |
A quiet flag means no conducive period in this window, so every alert that does fire is worth a look.
How the grey mould score is built.
Rules drawn from published greenhouse, vineyard and field models, tuned for greenhouse conditions.
A high-humidity minute
Relative humidity at or above 90 %, or air within 2.7 °C of its dew point. Both can be set per site: in-greenhouse calibrations came out below 90 %.
Weighted by temperature
Each high-humidity hour counts in proportion to a published temperature curve that peaks near 17 °C, so a mild wet night weighs more than a cold one.
Dry hours pause, not reset
A dry hour adds nothing and takes nothing away. Hours older than four days are dropped, because a spore that has not infected within 96 hours is dead.
A floor and a ceiling
Nothing scores below 4 accumulated hours. The score rises from there and reaches 100 at 24.
Bands from your own house
Red is the top 10 % of this house's last 60 days, amber the next 20 %, so every alert is measured against your own house.
Missing data never reads as safe
If more than a quarter of the readings are missing, Guard says 'not computed' instead of showing a low number.
Grey mould and powdery mildew pull in opposite directions.
Long unbroken hours near saturation drive grey mould. A wide daily swing in humidity drives powdery mildew, and sustained saturation holds it back. One sensor, two diseases, opposite signs — which is why no single 'good climate' verdict exists.
The humid hours that feed grey mould keep your predatory mites alive.
Dry the house hard against grey mould and you can quietly lose the biological programme you paid for. Published egg-survival limits give a corridor of roughly 70–90 % RH for Amblyseius swirskii and 60–90 % for Phytoseiulus persimilis. Guard shows time above, inside and below that corridor for the species you have logged, and flags nights spent on both sides, so you and your advisor can weigh disease control against your biological programme.
Built around what a grower can act on.
Every design choice below keeps a Guard score tied to the house it comes from.
Wetness read from the air
Guard counts high-humidity minutes and the dew-point margin, the air-based approach published greenhouse wetness models use, with no extra sensor to install or clean.
Cold nights accounted for
On a cold night leaves run colder than the air, so the dew-point margin, not humidity alone, decides when an hour counts.
Scouting, aimed
Guard tells you which nights favoured disease, so a scouting walk goes where it counts.
Placed where disease starts
A node reads the air where it hangs, so it goes in the humid corner where trouble begins.
Learns from your records
Pilot houses log what they find on scouting walks, and every season of records sharpens the scores.
Early enough to act
Incubation can run from hours to twelve weeks, so Guard flags the conducive nights themselves, early enough to change the climate or the spray plan.
From risk score to validated risk model.
Guard grows with every pilot house. Each season adds real outcomes from real houses, and each step below turns them into sharper warnings.
- Checked against a leaf-wetness sensor on a pilot node, for a season.
- A forecast of tonight's dew-point margin at the node, checked every morning against what it measured, over a winter.
- Scouting records from several houses showing that higher-scoring weeks were followed by more grey mould.
- A probability of finding grey mould, calibrated on houses the model has never seen, with its skill published.
- A validated risk model, checked independently at new sites in a new season.
Your scouting records are how Guard gets there.
One node, one subscription.
Guard is open to pilot houses now. Talk to us to put your house in the first season.
PhyriaPulse Guard node
€899
One-time cost. Air temperature, humidity, CO₂ and air pressure, plus disease-risk scores for grey mould and four other greenhouse diseases, built on published plant-disease research. Includes the node, enclosure, and installation support.
Guard subscription
€50/node/month
Everything in the Climate subscription, plus Guard’s disease-risk scores and alerts. Cancel any time.
A camera variant arrives in 2027, at €999.
All prices exclude VAT. Volume discounts from five nodes, and a further 15% on annual prepayment. Two-month pilot programme €1,700. Shipping from €6 within Finland and €9 internationally.
Tell us about your house.
We will tell you honestly whether Guard is worth it for your crop.
Talk to us