Brown Marionberry Fruit
My two year old Marionberry plants are producing a lot of fruit, but a large portion of the berries have gone from a beautiful red shade to a dead brown! Or, half the fruit is a beautiful purple with brown mixed in, making the fruit inedible. Any ideas?
It's possibly anthracnose. This article tells how to deal with it: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm