Onbekende groeiafwijking in aardappelen

In the summer of 1968 a peculiar and unknown growth abnormality of potato leaves has been observed. Leaflets in the top of plants grew stiff erect and showed an upward rolling along the midvein, together with a discoloration starting from the tip of leaflets. Its cause is not yet understood.Het onderzoek is door verscheidene onderzoekers verbonden aan diverse instellingen uitgevoerd.