Dead Lilac & Plumbago - what?

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Jenniewren Temple City, CA(Zone 11) Feb 10, 2014

I had a lovely Lilac and a Plumbago side by side. Within a couple of week leaves went brown and crisp.

Something went down the center core of tree (see photos) Any idea what it might be. Watering is not a problem

thanks so much

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Terry Murfreesboro, TN(Zone 7a) Dec 05, 2014

Bump...can anyone help Jennie diagnose her plant problem?

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sallyg Anne Arundel,, MD(Zone 7b) Dec 06, 2014

There is a lilac Borer
http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/insects/caterpillars/lilac-borer-and-ash-borer.aspx

but I can't say if that's the cause here. It would not cause the Plumbago to fail at the same time. I think the shrub would die branch by branch, not all at once.

I am on the other side of the continent so I don't know if my experience is the same and it is not very extensive in any case, with those two plants. My Plumbago (Ceratostigma plumbaginoides) grows in a spot thats pretty moist and about zone 7 full sun.

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