yellow powder stuff on my weeping willow

hi i was wondering if anyone could help me i have a weeping willow in its 2nd year. a yellow powdery substance has appeared on the backs of several leaves whatever it is its spreading and causing the leaves to shrivel any advice please
thanks gally

[ 17. August 2005, 06:28 PM: Message edited by: gally ]

 

Is it like this?
http://www.forestryimages.org/browse/subthumb.cfm?sub=12471&start=1

Not sure if Nathan can post a link to the original thread but this was discussed a short while ago, I have looked through the posts but can't find the thread where I posted a pic of rust on my weeping willow (salix kilmarnock)

some advice on control here
http://www.oak-wood.co.uk/forum/treecare/posts/15909.php

 

yes its exactly the same thank you very much what a great site!!