Toronto, Canada · 43.65°
Onion White Rot in Toronto
1405 hours in an average year meet every threshold this disease needs in Toronto, peaking in September. Those add up to about 90.4 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: 10–24°C · humidity ≥80%. 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 9 for hours favouring this disease in a year.
Remove affected material now
Take out the affected leaves, shoots or whole plants before the next wet spell, bag them as you cut, and wash your hands and tools before touching healthy plants.
Scout the planting while temperatures hold between 10°C and 24°C, with humidity above 80%.
Soil and crop debris. It waits in the ground or in last season's debris, so removing the plant does not clear the bed. Rotation and debris removal are the working controls.