Well, I done some further research as Della and Rick made me think on environmental damage. I heard about leaf scorch in cut flower lilies, but here is an article
Leaf Scorch On Lilies that describes that this can happen also in the garden. Especially in cold cloudy weather followed by sun... exactly what we have had now. The author also mentions similarities to frost damage, which goes well with Della's thoughts. Further looking at the images in the article the placement on the scorched area on the leaf goes well with what I've seen on 'Eurydice', as it's mostly located in the middle area of the leaf.
"Contributing factors to causing the symptoms include rapid root growth under warm conditions in wet soil or bulbs grown in cold, compacted wet soils with slow root growth." "Deficiencies in calcium and excessive amounts of fluoride in the soil can also cause this." For most of my lilies I have improved the soil quite a lot, but for 'Eurydice'... it's mostly sand as originally I had thought of planting some
Yucca filamentosa in that spot, before coming to my senses and planting lilies instead. Now sand can't hold nutrition very well so calcium deficiency isn't unreasonable in these conditions. I also found this from another source
"It tends to occur when elongation was most rapid and can result in withering of the whole inflorescence (van Nes, 1979)". Also certain cultivars are more sensitive than others.
Now of course I still welcome any other thought on the subject very much, including doomsday, horrible imported new pests, virus etc, but for now this theory sounds rather good.
Della, I'm curious to know if you by any chance would have had conditions like these when you saw damage in your plants?
