Amsterdam, Netherlands · 52.37°
Cabbage Root Fly in Amsterdam
4844 hours in an average year meet every threshold this disease needs in Amsterdam, peaking in July. Those add up to about 108 sustained favourable spells a year, and it is the spells rather than the scattered hours that lead to infection.
Risk in Amsterdam, next 48 hours
When conditions favour it in Amsterdam
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: 10–25°C. 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, Amsterdam ranks 3 for hours favouring this disease in a year.
Fix the cause, not the leaf
No spray will help here. The trigger is soil, water supply, nutrition or temperature, so change the growing condition and judge the result on new growth, not on damaged leaves.
Scout the planting while temperatures hold between 10°C and 25°C.
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.