I have a 3 year old peach fan growing in my green house. It has set fruit this year and is generally healthy apart from the tips of the top most branches. The leaves have a fine coating of delecate web like material and within the webs there are numerous tiny white bugs. The affected leaves are becoming very pale yellow and mottled and starting to drop off leaving bare twigs.
I have sprayed twice now with a systemic incecticide bayer bug clear ultra but the little "buggers" still persist.

any ideas anyone