I have a dwarf willow around 4.5 foot tall which is fairly new to my garden (we've had it around 8 to 10 weeks) It's planted into a large pot and is in good condition. I noticed this weekend though that some of the leaves had a rust like mark on the topside and the underside had a rust coloured 'blob'. Not every leaf is affected. is it something I should worry about and if so how should I treat it?
- 7 Jun, 2012