I've filmed a short time-lapse sequence of an aphid infestation on a
rose leaf bud. As the aphids multiply a hoverfly larva comes in and
devours the lot, showing how useful hoverfly are at being an aphid
natural pest control.

I've added the sequence and other time-lapse sequences for flowers etc
growing to my blog http://completegarden.wordpress.com
and youtube http://www.youtube.com/user/neilbromhall which I hope
you'll find interesting.