Greenfly: It's time for an intervention - I'm bringing in the ladybird larvae!

Well, I'm getting kind of tired of squishing a seemingly neverending supply of greenfly everytime I go past my rose bush. They're really starting to annoy me, especially as the rose is now close to flowering and so they're interfering with my appreciation of the soon to be flowers, as each time I look at the pink colour of the bud I can't help but notice some green bug walking over it. Argh!

So, i've decided that it's time for an intervention and have ordered some ladybird larvae through a company on the internet. I decided on the larvae as a) You get more larvae for less money than you do adult ladybirds, b) I figured that they'd be less able/likely to go and eat other people's greenfly as they're not so mobile, being as they lack wings!

Today, they I found an envelope with this little box in awaiting me on my return from work:

I've followed the instructions and sprinkled them, in the evening, around various of my plants. Now i'm awaiting what I hope will be a greenfly massacre... although the larvae did seem very small so i'm worried that the greenfly might fight back. I'll just have to wait and see... here are two larvae on my rose bush off hunting aphids! (but you can see from the photos just how small they are...)