tons of berry briars but no berries

Question

We have 57 acres. Most have blackberries and raspberries growing wild. Most raspberries are small. The blackberries were great, but this year there were few berries. We also have lots of briars but no berries. Why?

Answer 1

There is a virus that can cause blackberries and raspberries to become sterile. Wild brambles are particularly at risk. This article has more information: https://www.gardeningknowhow.com/edible/fruits/blackberries/blackberries-not-fruiting.htm