Marionberry canes turn black and die

Asked February 8, 2020, 1:11 PM EST

Hello, I have two established Marionberry canes that produced well for 6-7 years, but the last 2 years as the new canes are growing they will start to get dark spots and then will die. What's going on? Thanks!

Multnomah County Oregon

1 Response

Caneberries such as Marionberries can be affected by disease and/or pest issues. Cultural problems are sometimes at fault, such as when a previously sunny spot becomes shaded by adjacent tree growth.
A new pest is the rose-stem girdler. Long-time problem is verticillium wilt. Follow your plants closely this spring-summer and send photos of damage as it happens. The Master Gardener Clinic volunteers at the county Extension office are another resource.