Hutton criteria - late blight indicator for potato

Late blight in potatoes is a serious "outbreak" disease, which can lead to considerable yield losses and tuber destruction in storage. Crop rotation, spaced planting and morning irrigation can help you manage late blight pressure. But once the first plants are affected, if the weather conditions are favourable and the disease is not treated in time, late blight will spread rapidly, regardless of the stage of development.

The Hutton criterion takes into account rainfall and dry temperature, calculated from ultra-local weather data from Sencrop stations. These conditions are: two consecutive days with, each day, a minimum temperature of 10°C and, at least 6 hours with a relative humidity of ≥90%. It can be interesting to use it in conjunction with DSTs (Decision Support Tools).

Thanks to this indicator of mildew pressure specific to your plot, show reactivity in your treatments, whether they are preventive or curative.