Raspberry Plants Under Attack

Cane borers can infest and destroy raspberry plants, so how do you get rid of them?
By the MOTHER EARTH NEWS editors
June/July 2001
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Delicious raspberry plants can quickly be destroyed by cane borers.
Photo courtesy RICK WETHERBEE


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We are having a problem with the new shoots on our eight-year-old raspberry plants. They seem to be under attack by some sort of worm. Right now we are burning the tops of the plants away so that neighboring plants don't get infected. Is there anything else we can do to get rid of the problem, or do we have to get rid of the plants all together?

 — George, Rawdon, Quebec

Your berry plants are being attacked by cane borers — probably the larvae of the black and orange raspberry cane borer beetle or of the raspberry crown borer. Both species produce a single generation of offspring each year and have a two-year life cycle: eggs and larvae the first year, adult phase in the second. There is no way to get to larvae once they hatch inside a cane, so you're doing precisely the right thing: breaking off and burning borer-infected canes as soon as you notice damage. Keep it up for the next two years, even if your crop is severely diminished. Your eight-year old plants are close to the end of their ten-year prime.

We'd recommend that you use the established planting to get rid of the borer population and plant any new crops in another location — preferably on raised beds to guarantee good drainage and avoid root rot. You might want to get a copy of The Backyard Berry Book by Stella Otto a useful, hands-on book about growing small fruits in the home garden.








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