y also stems and fruits. They cause lesions on the upper leaf surface, bordered by the veins, which are first yellow and then turn brown. On the underside
(Phytophtora infestans f.sp. infestans ) causes water-soaked lesions with vague borders and white fluffy fungal growth on the leaves. The centre is grey-brown with
The side roots rot and very little of the root system survives. On the border between air and soil or substrate the plant turns brown. A typical symptom
crop where pest activity is likely to be concentrated. These can include border zones (entry points, ventilation openings, corners, walls), transition areas
