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
Does fruit grow on new or old wood? How do I prune them, if any? At the end of the fruit season, do I cut off the long straggly vines or weave them into the trellis? I know to prune the vines that produced this year, but do I have to leave all that length?
The berries form on 2 yr old canes.
To prune remove all but 6 to 12 of the healthiest new canes from each plant, cutting the canes back to the ground.
Wrap the remaining canes around the support.
Here is a link with more information.
The lower leaves are turning yellow. This is my first attempt growing these plants, they are in 35gal soft pots,I live on the Oregon Coast so it is wet to say the least. I made a spray for my roses with mild soap, drop of mineral oil and water for fungus/black spot could this also help the berries? Any advice would be welcome.
Berries such as this require VERY large root zones. They will do ok in those cloth pots, but even then they tend to require a good deal of maintenance. Even though it stays moist in your area, it is good to keep in mind that those pots are not designed to hold water in any sense. If there is a day that it does not rain, you may find yourself watering these twice a day.
Also, because of the design of the cloth pots, this means nutrients can be quickly drawn out of the soil. Not to mention those plants are heavy feeders. This appears to be a mild deficiency, which can be corrected be applying liquid fertilizers every two weeks, or a slow release once every 2 or 3 months.
How do I prevent wild blackberries from invading my marion canes? I live near Salem, Oregon and we're always finding volunteer canes everywhere/
These plants can be a bit of a hassle to control. The best, and safest method for removing blackberries, is to manually dig them up by hand. They are quite invasive and will continue to come back. It would be hard to recommend an herbicide as they will likely kill plants that you didn't want to kill as well... I'm sorry but there isn't an easy answer to this one. Set aside a time to remove daily or weekly and you will have those out of there in no time
They are not sweet or very soft. And, some have a woody part on the berry.
This article gives you tips about growing conditions and care:
Check all the requirements in this article and see if there isn't something that's missing in your plants' environment, soil, and water. If all conditions are good, you may want to contact your local extension service for more information.
They are about 1/2 inch long slender, slinky and shiny black.
Unfortunately, your photo did not come through. I am unable to ID the pest in question.
Likely, general purpose insecticides will work just fine. Here are some articles that will help:
My marionberries in the last 2-3 years appear more like a blackberry in shape--more rounded and smaller. They don't have the elongated shape. They still have the tarter taste and flavor of the Marionberry. What has happened?
It sounds like the soil fertility needs to be improved. These articles will help: