Grubs or Weevils?

[Beng]

I was repotting a very old satsuki I just recently bought and the soil had lots of larvae burrowed in it. Can anyone identify them from the picture? As it was an old satsuki there was no way to get to every nook and cranny in the rootball. I removed every one i could find and killed them but I'm sure a few remain. My guess was they're vine weevil so I ordered and treated it with beneficial nematodes (Hetrorhabditis bacteriophora and Steinernema carpocapsae.) I'd like to follow that next week with some kind of an insecticidal dip. Zerotol (a fungicide) has been suggested to me by the seller but I can't find a reference to it treating weevils or grubs anywhere on the net, and 150+ is a lot to spend...

 

[bonsaibp]

Bayer makes a product called Grub Control made for grubs in lawns that I've used in the past when I bought a bunch of trees that had them- worked great.

 

[Beng]

Bayer makes a product called Grub Control made for grubs in lawns that I've used in the past when I bought a bunch of trees that had them- worked great.

Any idea who might have that locally? I own a bottle of Merit 75wp which may be the same ingredient I'll do a google search.

 

[Beng]

Looks like bayer grub controls not labeled for vine weevils which is my current guess for the pest pictured above. But it's active ingredient is the same as Merit so it should work.

From this article it sounds like bifenefrin is the best killer. I happen to own that as well so ill do a soak of that combined with merit 75. All flower buds have been removed so I don't have to worry about it killing the bee population.

http://www.rhododendron.org/v57n4p219.htm

 

[Poink88]

I believe imidacloprid (available in various brands) take care of both grub and weevil (please verify). Problem is, it is a systemic thought of killing bees and bad in conjunction with flowering plants. If you treat after bloom and again couple of months after then stop, it should be okay.

I use Bayer tree and shrub. I have both liquid and granule form

 

[Beng]

I believe imidacloprid (available in various brands) take care of both grub and weevil (please verify). Problem is, it is a systemic thought of killing bees and bad in conjunction with flowering plants. If you treat after bloom and again couple of months after then stop, it should be okay.

I use Bayer tree and shrub. I have both liquid and granule form

Yep this tree won't bloom this year I removed all the buds. Although I could have missed one I'm sure I got 90% or more of them.

 

[edprocoat]

Have you identified them yet? I thought they were grubs as I used to dig for ones like that as a kid in Ohio, either way I hope you killed them on a fishing hook as they are great bait.


ed

 

[Beng]

Have you identified them yet? I thought they were grubs as I used to dig for ones like that as a kid in Ohio, either way I hope you killed them on a fishing hook as they are great bait.


ed

They met death beneath my shoe one by one, it was a grub/weevil massacre. Spent 4 hours with the roots trying to find all their hiding spots but i'm sure I didn't get them all... I believe they are these http://swindon-bonsai.co.uk/2014/01/27/vine-weevil-otiorhynchus-sulcatus/ but they could be grubs as well I can't tell from the pic. Now the trees potted up in new kanuma so it's hard to know for sure. It was my first time dealing with a pest like this in soil.

 

[edprocoat]

Beng, I read your link and it said they are indeed grubs, the larval stage of the Vine Weevil. It seems your topic "Grubs or Weevils?" is right on both accounts!

ed