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Old 06-05-2012, 06:47 AM
Location: NJ
4,535 posts, read 9,787,069 times
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I have a common lilac bush that is fairly young and small. I planted it last year and this year it uis showing a lot of new growth. I recently noticed 1 branch where the leaves turned yellow and appeared to be dying. The entire branch was affected so I cut it off at the base. The rest of the bush seems fine. Could the yellowing be due to disease? And if so, is the rest of the plant at risk? Should I pull out the entire plant so the soil does not get contaminated?
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Old 06-05-2012, 07:27 AM
2,063 posts, read 6,708,168 times
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The symptoms sound exactly like a Lilac stem borer damage. It was a good idea to prune away the stem right away as you may have caught the problem if you only had a single new borer.

The following is an excellent description of what it is and what to do about it.

Ash-Lilac Borer: A Common Pest in Iowa
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Old 06-05-2012, 05:14 PM
Location: NJ
4,535 posts, read 9,787,069 times
Reputation: 3791
Thanks for the reply. I did some digging in the soil and found some dark brown worms about 1 inch long with 2 antenna. I found about 10 of them in the soil directly beneath the lilac. They look darker than the bug in the picture in that link. Would borers be living in the soil beneath the bush, or is this some other kind of bug? Is there anything I can do to kill them? I closely inspected the dead branch and did not see any exit holes.

Last edited by ansky; 06-05-2012 at 05:33 PM..
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