OK so when I was redoing the lime and mulch in my potted trees - I found a couple grubs in the pine mulch ! Oh yuk. Not in all the pots , but a couple . Does this mean that they are in the soil and I have to repot with new soil ? Is there something I can use on them to kill them without harming the trees - and not be poisonous ?
There is a "milky spore" product - any opinions on this stuff?
Thanks everyone...

There are lots of grubs that only eat dead/composted plant material and pose no danger to plants or trees. There are exceptions though. I'm no expert on this but pictures are going to help someone identify your grubs.

Only eat dead/composted plants.. Interesting.

Most of what people see around roots are baby cicadas. Other grubs do eat the decomposing matter like worm eating matter in the soil also. Pictures would better help. I just use them as fishing bait or fish food.  

I had the same problem in one of my pots, was advised to use Milky spore, which seemed to minimize the amount of grubs. However, it could take 2-3 years of using milky spore before they are all gone. With that said, the fig tree continued to produce for the past few years even with the grubs in the soil. They seemed to be harmless to the fig tree, though I find them rather gross.

Thanks everyone.
Mautzi , I bought the Milky Spore. Put a sprinkling on each of my pots although , I'd only seen them in 2. I don't think they are eating much at this time - read it was more in July/aug and then again in fall. So will reapply then as well. I also read it will take a few years to get the amouints of "organisms" at maximum as far as a yard was concerned. I'm hoping that since the area is much smaller in my pots - that it will biuld up far sooner.
 LOL , I find them gross also !

I found these guys in the yard today.  I don't know what the larger one was going to be?  Anybody know what it is?

I believe that grubs will transform into something and leave the pots after a certain period as it happens in the lawns.

Around here the grubs are usually from Japanese beetles and june bugs, I usually find some around when digging a new hole or bed, I always just feed them to the dogs who love them, the birds usually take care of them as well, when the beetles mate in the summer they put their eggs into the soil that pupate and emerge the following year.  I am not too worried about them, if you find a lot then they will most likely eat your roots but normally they leave things well enough alone.  You may find skunks digging up your yard looking for them though.

Oh good grief - you win ! You have the biggest, ugliest grub in your yard !  Although after reading some posts on grubs some might say the yummiest - not me - gives me the heebie jeebies . :)

Tom,

I believe the larger one is a cicada.  The smaller ones are Japanese beetles or June bugs.  The June bugs here in Florida are two to three times as big as the ones up north so the grubs are BIG..the ducks like them though.  Thankfully we don't have Japanese beetles down here.  

Thats a june bug  grub, it should hatch and fly off soon. Rex

Any insect you find can be put in alcohol in a bottle and sent to whatever land grant university that's in your state (or to an extension agent).
Just look up their insect ID lab.
In Virginia that's at Va Tech.
This is a service you already pay for.
Some grubs are good for your plants and soil as the help aerate and eat decaying material.
All grubs are great bait or bribes for your chickens. 
Seeing a grub or two is no reason to get upset.
The more diversity and critters (when balanced) the better the health of your surroundings.
To understand nature is a life long quest that gets more complex and more beautiful the closer you get.
Ok I can't find a soap box so I'll stop now.