Grubs eating succulent roots/stems!!!

sf4023stOctober 30, 2013

Every year I have the same problem! Usually during this time a majority of my sempervivum, sedeveria, echeveria, and pachyveria get infested with these ugly grubbs. Perfectly roots plants will 'pop' off at the base and topple to the ground or worse they'll be eaten from the inside main stem causing the entire plant to fall apart so they can't be rerooted and saved. Ive attached a picture of these awful things. I've been using Bayers systematic insecticide but doesn't seem to work. Can anyone identify and diagnose?

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We had those darn things in our backyard last year,and the skunks tore our yard to shreds trying to get them.

I went and got spectracide and covered the lawn with it and watered it in good.It took a week or so,but I finally got rid of them,and the yard is still a work in progress.

I hate those ugly things with a passion!!!!

    Bookmark   October 30, 2013 at 3:57AM
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bikerdoc5968 Z6 SE MI

Since I summer all of my plants outside, I have had this exact problem. The large would eat up the center of the stem and the next thing I knew was an almost dead plant. I now use Imidacloprid granules on all plants. I dose each plant in late August/early September. It's supposed to be good for 3 months. Either the insects don't like laying eggs on my plants anymore or it's working because I haven't lost a plant in the last several years.

    Bookmark   October 30, 2013 at 8:34AM
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nil13(z21 L.A., CA (Mt. Washington))

Isn't the active ingredient in Bayer systemic, imidacloprid?

Have you tried milky spore?

    Bookmark   October 30, 2013 at 11:20AM
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bikerdoc5968 Z6 SE MI

Yes, it is but the granules hang around for an extended period of time whereas the spray will wash through.

    Bookmark   October 30, 2013 at 1:21PM
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Thank everyone for replying! I've tried both the Bayer as granules and the liquid diluted and honestly don't see it helping since I found out about it last year. But I only have dosed the plants a couple of times since both versions had fertilizer and I didn't want to overfeed my plants. I'll try repotting the plants in a peatless mix as some has suggested.

Thanks again!

    Bookmark   October 30, 2013 at 7:41PM
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Haven't tried Milky spore, do you think it will work on this type of grub? I'm not sure what type this is, after researching Milky Spore it sounds that it only controls Japanese beetle larvae?

    Bookmark   October 30, 2013 at 11:01PM
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and my grubs don't look like the Japanese larvae, they don;t have the long front legs.

    Bookmark   October 30, 2013 at 11:03PM
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bikerdoc5968 Z6 SE MI

The imidacloprid granules I use don't have any fertilizer; it's just the insecticide.

    Bookmark   October 31, 2013 at 8:30AM
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you can also get imidacloprid in a 2oz.'s a powder. Costs more upfront but more economical in the long run. Mix with water and use as a drench OR mix and use as a spray (for other insects-not grubs)
If you have been using this insecticide for awhile it might be time to switch it up and use something else to keep the bugs from building up a resistance.

    Bookmark   October 31, 2013 at 7:07PM
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Thanks again all. I'm going to continue using the Bayer systematic as pellet and search for a non fertilizer combo but Does anyone know if Milky Spore work on this type of grub?

    Bookmark   October 31, 2013 at 11:46PM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL(8B AL)

Don't these things eat compromised/unhealthy roots, and need a moist, 'soft' environment in which to do it? I don't think these things would bother healthy roots/plants in a more suitable, more dry medium. Once the peat and other fine particles are replaced with something much more chunky/airy (and likely much less comfortable for a soft-bodied critter,) the problem should be fixed without the need for further chemicals. Until you can repot, let the peat dry out well before adding more water. I've not had grubs in pots before, but pill bugs (a similar entity) show up sometimes in some pots, but never in succulent pots.

    Bookmark   November 1, 2013 at 11:28AM
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birdsnblooms I know the name of those ugly, slimy, wormy pests I found in pots of certain succulent/cactus.

Is there an organic, 'spice/vinegar' that'll rid grubs?

They linger in pots within a larger pot.
Heck, I've found these creatures inside containers w/o plants.

Purple, I have to disagree. I found grubs in large Agaves and Aloes containers..plants were so rootbound there wasn't any soil.
Grubs were stuck to roots.
Also, like I said above, they stick to over-turned pots w/o plants.

I hope someone here knows how to rids grubs organically. Thanks, Toni

    Bookmark   November 1, 2013 at 12:32PM
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bikerdoc5968 Z6 SE MI

As I said, I use Bayer Advanced Complete Insect Killer Ready to Use Granules, $12.97 for a 10# bag at Home Depot. It may be a seasonal item so people living in more northern areas may not be able to find it at this time of year.

    Bookmark   November 1, 2013 at 9:51PM
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greenclaws UKzone8a

They look like Vine Weevil grubs to me, apologies if someone has named them in the previous posts (can't see where they have been ID'd though) so that may help you find a specific cure. I know here in the UK we have a spray to target VW grubs, but as I'm currently over 200 miles away from my bottle of spray I can't go and look at it ....but it is manufactured by Bayer as far as I can remember. Ah-ha, just googled it...its Bayer's 'Provado VW' killer. Hope this may help you.
Gill UK

    Bookmark   November 2, 2013 at 5:27AM
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puglvr1(9b central FL)

Just as a heads up for the people that use the liquid Bayer (link below) the direction for containerized plants say not to water heavily for the first 10 days after application so the roots can fully absorb the product. I only lightly water my plants for those first 10 days...making sure water does not exit from the pot...then after 10 days normal watering can be done...

Here is a link that might be useful: Bayer Advanced

    Bookmark   November 2, 2013 at 10:40AM
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