Blackberry Plants
Q.

Reuben Blackberry

Khadgar added on September 23, 2016 | Answered

A couple of weeks ago I bought a Reuben Blackberry plant and I noticed strange red spots on it. Now the leaves are beginning to turn yellow and dry. I used Natural Peat for this plant (local gardeners recommendation).

A.
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Alisma
Certified GKH Gardening Expert
Answered on September 23, 2016

The simplest explanation for the yellowing leaves is transplant shock, which is very common in the first few months after transplanting:

https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

The red spots could be caused by Blackberry Purple Blotch, a disease caused by Septoria fungi, especially if the spots are/were present on the stems as well:

http://whatcom.wsu.edu/ipm/manual/black/purple_blotch.html

Alternatively, the symptoms for Anthracnose might also match for the spots:
https://plantdiseasehandbook.tamu.edu/food-crops/fruit-crops/blackberry-dewberry-and-boysenberry/

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