Nerine thoughts:
J.E. Shields (Wed, 25 Aug 2010 11:15:44 PDT)

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.
.........

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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