Hello all, Tom wrote: <<Imidacloprid is also the effective chemical in Bayer's Advanced Tree and Shrub insecticide.>> Imidacloprid is the active ingredient in a recently introduced insecticide named 'Provado' in the UK. It was marketed under the slogan 'The last supper for vine-weevils'. It also appears to be the last supper for just about everything else. It effectively kills vine-weevil (adults and grubs), lily-beetle (adults and grubs), greenfly, mealy-bugs, scale insects and just about every other bulb-nasty. Some reports from other bulb growers are saying that it is also an effective miticide and deals efficiently with red-spider and even bulb-scale mite. It does not claim to be effective against narcissus-fly grubs but I've not seen any further attacks on treated bulbs since using it - even though I've frequently seen the fly out in the garden. It is especially effective because one application (soaking the compost) remains active for months. They have just introduced an aerosol version under the name: 'The Ultimate Bug-Killer' primarily for indoor plants. The downside is that it is very expensive. I endorse Tom and Jim's comments that it really works. Cheers. Den Wilson Isle of Wight UK. Zone 8 (maritime) almost frost-free.