terrycrynant's picture

Knotweed disease ?

Observed: 22nd April 2011 By: terrycrynantterrycrynant’s reputation in Plantsterrycrynant’s reputation in Plantsterrycrynant’s reputation in Plants
033 1

Are these marks on the leaves of Japanese Knotweed a disease ? There were many leaves on different plants over a large area showing the same pattern of marks.Leaves which were less heavily marked had spots on the tip and outer edges of the leaf.The area along the midrib of the leaf is the last to show spots.

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sally.luker's picture

Japanese Knotweed disease?


My local patch of Knotweed is showing markings the same as those above. Have had a nose at leaves under the microscope, which failed to shed any light on the subject, so my search for answers continues!