Curl Grub

We have some unique pests to deal with in Australia. Post your experiences and treatments here for others to learn from.
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Redsonic
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Curl Grub

Post by Redsonic » May 12th, 2019, 4:01 pm

I found 10 of these little assassins in a 155mm nursery pot the other week when I finally got around to potting up a Jaboticaba I bought about a year ago.
Being beetle larvae, I gather they are unlikely to have originated at my place, because all my plants are on raised mesh shelves?
Anyway, I have never seen these guys beyond the first potting into bonsai mix.
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melbrackstone
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Re: Curl Grub

Post by melbrackstone » May 12th, 2019, 4:04 pm

Diatomite used to be the best way to stop the beetles laying eggs in your mix, I understand, because the minute skeletons caused the eggs to be shredded...

Don't know how we're going to stop them now...

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Re: Curl Grub

Post by Redsonic » May 12th, 2019, 4:09 pm

Yes, it made me nervous to be potting the tree into a mix without diatomite. Are there likely to have been eggs in the soil? I am hoping the grubs don't like the sharp zeolite and scratchy pumice I am using now :fc:

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Re: Curl Grub

Post by melbrackstone » May 12th, 2019, 4:15 pm

Didn't you buy some more diatomite recently? Just a thin layer across the top might deter new grubs...I would hope the majority of the eggs would have hatched into those evil grubs by now?

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Re: Curl Grub

Post by kcpoole » May 12th, 2019, 5:17 pm

From what I understand they are laid on the surface by beetles and then they grow from there.

Regarding the use (or not of Diatomite) Curl grubs like these are the reasons I moved to non organics based oon diatomite about 15 years ago.
Siince the quality went south a few years ago i have moved on to Akadama, Pumice and Zeolite instead.

Still no curl grubs and still can reuse my mix when repotting.

I sell a 14 L bag of my premix as above for those that want small amounts or want to try it out.

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Re: Curl Grub

Post by Redsonic » May 12th, 2019, 6:33 pm

melbrackstone wrote:Didn't you buy some more diatomite recently? Just a thin layer across the top might deter new grubs...I would hope the majority of the eggs would have hatched into those evil grubs by now?
I used that crumbly diatomite in my vege garden - now regretting not saving some. Thanks for the info, Ken. I wonder if 30% organics in my mix will be enough to support the grubs. I will update this post if I see any in my mix.

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Re: Curl Grub

Post by melbrackstone » May 12th, 2019, 6:46 pm

you can still buy diatomite dust, which is used in the bee industry.... also to stop fleas breeding on the ground where dogs tend to spend a lot of their time in summer...

I heard that the Capalaba produce store was going to be stocking the potting mix size again soon...

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Re: Curl Grub

Post by shibui » May 12th, 2019, 8:36 pm

I gather they are unlikely to have originated at my place, because all my plants are on raised mesh shelves?
The adult beetles can fly. One may have decided your pot was a good place to raise a family. One year I had some in pots on my raised benches but have not seen them since even without diatomite in the mix but I doo keep an eye out for the tell tail signs.
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Re: Curl Grub

Post by kcpoole » May 12th, 2019, 11:09 pm

Redsonic wrote:
melbrackstone wrote:Didn't you buy some more diatomite recently? Just a thin layer across the top might deter new grubs...I would hope the majority of the eggs would have hatched into those evil grubs by now?
I used that crumbly diatomite in my vege garden - now regretting not saving some. Thanks for the info, Ken. I wonder if 30% organics in my mix will be enough to support the grubs. I will update this post if I see any in my mix.
Many members of the School use Rays mix and blend it with inorganics 30% and rarely see them.
1/3 inorganics or more usually stop them infesting the pot I think.
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Re: Curl Grub

Post by melbrackstone » May 13th, 2019, 8:33 am

That's true for me too, Ken. I have probably used even higher percentages of organics at times, but always added diatomite as the curl grub shredder.

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