Toronto, Canada · 43.65°
Leatherjackets in Toronto
39 hours in an average year meet every threshold this disease needs in Toronto, peaking in April. Those add up to about 0 sustained favourable spells a year, and it is the spells rather than the scattered hours that lead to infection.
Risk in Toronto, next 48 hours
When conditions favour it in Toronto
Hours in an average month when conditions meet every threshold this disease declares (2021–2025). Faded bars are months the database does not list the problem as active.
This disease's thresholds: 5–22°C · humidity ≥80% · wet leaves / rain. Every hour in the archive was tested against them.
These come from the ERA5 reanalysis on a roughly 9 km grid, so they describe the area rather than your plot. A shaded, sheltered corner holds leaf wetness longer than open ground, so conditions there can favour it more often than the figure suggests. This is a climate profile, not a forecast — the panel above carries the current risk.
How this compares
Of the 13 locations published here, Toronto ranks 2 for hours favouring this disease in a year.
Treat, then re-check in 5–7 days
Pick off the worst material, apply the organic option below, and look again after five to seven days. If the spread continued, escalate rather than repeating the same treatment.
Scout the planting while temperatures hold between 5°C and 22°C, with humidity above 80%, after rain or heavy dew, while the leaves are still wet. Risk builds after roughly 12 unbroken hours of those conditions, so the morning after such a night is the moment to look.
Carried by insects. An insect moves it plant to plant, so controlling the carrier matters as much as treating the symptom. Check for the vector before assuming the plants infected each other directly.