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zone 5 - northern Illinois
Jun 26, 2017 10:27 AM CST
|Discovered I have rose weevils (the grayish-brown type) on my knockouts. Took a few weeks to figure it out so they've been there a while now. I sprayed with soap water yesterday and killed a few, but today I found a bunch more and drowned them. From what I've read their larvae will damage the roots and eventually kill the whole bush. How do I know if larvae are present? Should I use a systemic pesticide? They've already done so much damage and I don't have a lot of time to hunt down the adult ones on a regular basis due to my hectic schedule.
P.s. last week I sprayed a pesticide/fungicide (I have black spot as well), but that obviously didn't help.
Jul 1, 2017 2:15 PM CST
Sounds like you`re on the right path on info gathering.
Don`t use to many products too close together, could be detrimental. I`d look at trying an (organic) insecticidal soil drench targeting killing the larvae to break the life-cycle of the weevil. Wait on BS. Weevil larvae more important I think.
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