Borers on a 'Diablo' Ninebark

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bigcityal Appleton, WI(Zone 5a) Sep 02, 2006

I am really more upset that this could happen than did since I hadn't seen them listed as a problem.

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Resin Northumberland, United Kingdom(Zone 9a) Sep 03, 2006

It's turned into an Eightbark . . .

I'd think it should re-grow from the roots OK (though if it is a grafted cultivar, the rootstock shoots might be different).

Resin

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bigcityal Appleton, WI(Zone 5a) Sep 03, 2006

I will spray it will Onyx which is one of the better borer insecticides right now and hope for the best. It had been flagging on the one side since spring and I thought it was from some root damage since I dug up a shrub near that side just before.

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escambiaguy Atmore, AL(Zone 8b) Sep 03, 2006

What about one of those soil drench insecticides?

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bigcityal Appleton, WI(Zone 5a) Sep 03, 2006

Merit would probably work - I don't have any right now, I will this fall.

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ViburnumValley Scott County, KY(Zone 5b) Sep 03, 2006

Quoting:
It had been flagging on the one side since spring and I thought it was from some root damage since I dug up a shrub near that side just before.


Borers probably aren't a problem, unless you stress the plant for some reason. I'm with Resin; this kind of plant will normally rebound with normal attention to moisture/fert, especially if you knock off the pest.

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bigcityal Appleton, WI(Zone 5a) Sep 03, 2006

I'll treat the pest. Not that I have a lot of money in that shrub, but I do have 3 others. I'm not sure what borers they get, but I did have this in my yard recently.
http://davesgarden.com/forums/t/644185/

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ViburnumValley Scott County, KY(Zone 5b) Sep 03, 2006

Since Physocarpus is in the Rosaceae, you might lean in that direction for a culprit. And there are lots of them.

If you saved the little bugger, send him to your Extension Service diagnostic lab for ID. Pirone's book on trees and shrubs might offer some advice as well. Physocarpus doesn't show up in too many texts; Johnson & Lyon (Insects That Feed On Trees and Shrubs) has no listing for it at all.

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