Hi Nikko, Sir Peter and I discussed the "viruses" a couple times. He thought there might be a latent virus, perhaps constitutive, in the broadleaf nerines that was activated by nitrogen fertilizers. Having seen how they reacted to high nitrogen feeding, I tend to agree with his notions, even though many plant people with whom I've discussed this don't agree with the "virus" bit. So the alternative is that these nerines have a physiological quirk that reacts to high nitrogen intake in a way that mimics a virus infection. You pays your money and your takes your choice! No one has actually looked for a virus, so far as I know (one would need an electron microscope.) Jim Shields At 06:02 PM 8/25/2010 +0100, Nick wrote: >......... >2) we feed with a balanced 10-10-10 fertilizer- but I will try dropping >all the nitrogen this year- I don't think the 'virus' that develops with >nitrogen is a virus- though I had noticed this yellow tracery appears on >occasion- we thought it was insect induced. >......... ************************************************* Jim Shields USDA Zone 5 Shields Gardens, Ltd. P.O. Box 92 WWW: http://www.shieldsgardens.com/ Westfield, Indiana 46074, USA Tel. ++1-317-867-3344 or toll-free 1-866-449-3344 in USA