Final diagnosis


Phytophthora infestans (late blight)

Dark brown leaf spots, surrounded by a light green to yellow halo and white felting on the underside of the leaves. <i><b>Phytophthora infestans</i></b> (potato late blight)
Complete defoliation. <i><b>Phytophthora infestans</i></b> (potato late blight)
Rots on tubers.<i><b>Phytophthora infestans</i></b>
Superficial rust-coloured to brown rot which enters the flesh of the tuber. <i><b>Phytophthora infestans</i></b> (potato late blight)