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Re: Cane Borers


-----Original Message-----
From: rosenlund <rosenlund@transport.com>

>Apparently there are different kinds of borers, and that one kind
>does like the rugosa type roses better (which Therese Bugnet is).
>One book implies that some can "attack" the tips, where as other
>borders enter at a cut or wound.
>
>Have you seen any larva in these hollowed out canes ?  You might not.
>Be sure to burn the bad canes, (recall my sister had to keep cutting
>till she reached good wood.) and seal the cuts. One rose stem girdler
>is spiral just under the bark, sometimes causing the cane to swell
>and break.
>
>You might take it to your extension office and/or their Master
>Gardener.  Would like to hear back when you find out.
>
>Sincerely,
>Carleen Rosenlund of Rainier, Oregon -USDA-8
>Sweetbriar - Keeper of Sheep & Old Roses
>
>----------


There are several species of cane borers. They all use the most advantageous
point of entry - if you prune, it is through the pruning cut. If you don't
prune, they simply tunnel into the soft tissue of the newer canes. Sealing
the canes *may* help, but often it just forces the borers to alter their
tactics! Personally, I would rather they entered through the pruning cut,
since these holes are easy to spot, allowing the infestation to be pruned
out early.

-Dave-
Lake Forest, CA. Zone 9
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