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.)

R de Boer