Trillium 2017

[Shadylanejewel]

Trillium grandiflorum f. roseum

Very nice form!

Julie

[Herman Mylemans]

Very nice form!

Julie

Thank you Julie, but there exist still darker forms.

[Herman Mylemans]

Trillium flexipes

[Herman Mylemans]

Trillium flexipes 'Susquehanna'  is a crossing flexipes x erectum

[Rimmer de Vries]

Trillium decumbens a bit batteted from emerging too early

[Thorkild Godsk]

Trillium from today:
Trillium cuneatum
Trillium Western sissile hyb. Yellow Beige
Trillium hyb. chloropetalum or angustipetalum?
Trillium chloropetalum "ice cream"
Ovatum hibbersonii

Thorkild DK.

[Herman Mylemans]

Thorkild, your hibbersonii is doing very well. What soil or mixture do you use?

[Thorkild Godsk]

Herman, it is in the Sphagnum peat, coarse sand, 2-4 mm Lega mixed with a little garden soil (slightly heavy soil) more than they other Trillium.
Thorkild DK

[Herman Mylemans]

Herman, it is in the Sphagnum peat, coarse sand, 2-4 mm Lega mixed with a little garden soil (slightly heavy soil) more than they other Trillium.
Thorkild DK

Thank you Thorkild

[Carolyn]

As WimB said, it is possibly Urocystis trilli and smut is very distinctive - discussion in 2010 on SRGC

http://www.srgc.net/forum/index.php?topic=6303.0

There are other fungus and your photo appears very similar to the one on the following link.

https://mail.google.com/mail/u/0/#inbox/15b53e43dfa62044?projector=1

Julie

Thank you, Julie, I had found the 2010 trillium thread. I can't get your other link to work, it takes me to a signing in thing on gmail. Could you please post it again?
I have sent a sample off to the RHS and would expect a reply in a couple of weeks. I will report back then. In the meantime, my paris quadrifolia are not looking as good as usual.....

[Carolyn]

I have just received a reply from the RHS advice service, having sent them a sample of diseased trillium. Good news and bad, I think. Here is what they said:


"Thank you for your enquiry to RHS Gardening Advice.
Your Trillium is not infected with trillium smut. Smuts develop within the plant, producing a mass of black spores which burst out of splits in the plant surface. On Trillium the smut caused by Urocystis trillii grows mainly within the stems.

The fungus causing the disease you have observed on your plants is a species of Colletotrichum. This causes black spotting on leaves. It is known in the USA and has been observed on Trilliums in the UK.

Cultural control methods should include:

avoiding overhead watering
promoting good air circulation
not handling wet plants
controlling pests if needed
separating diseased and healthy plants - avoid touching healthy plants with hands, gloves or tools that have been near diseased plants
pruning out the worst-affected leaves
clearing up fallen leaf litter
good horticultural care - appropriate feeding and watering etc.
There are no specific fungicides tested for use on trilliums. The fungicides tebuconazole (Bayer Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Bayer Fungus Fighter Plus), and triticonazole (Scotts Fungus Clear Ultra and Scotts Fungus Clear Ultra Gun) are approved for use against various fungal diseases on ornamental plants and could be used, but there is no specific information on their efficacy and no claims are made by the manufacturers for control of this particular disease. If the decision is made to try one of these, a few plants should be sprayed first to test whether the fungicide has any damaging effects on trilliums."


I haven't decided whether to spray with fungicide. I am not keen to use chemicals in the garden, but on the other hand, I do have quite a lot of trilliums which I do not want to lose. Perhaps some of the trillium growers here could offer their advice? I wonder how the fungus arrived? Did I buy an infected plant? (The plants which are showing signs of infection were grown from seed here in my garden, apart from the original plant, given to me 10 years ago by a friend). Does this fungus spread with wind and rain, like potato blight?

[Mariette]

Trillium hyb. chloropetalum or angustipetalum?

This one has very striking leaves! Please, show a pic of it when in flower!

[Thorkild Godsk]

Mariette, Here is a picture of this Trillium
Thorkild DK

[Mariette]

Thank You, Thorkild - a really striking plant! If You´d like to swap seed, I´ve pollinated this chance seedling, either Tr. erectum or an  erectum -flexipes hybrid with similar ones.

[WimB]

Trillium sessile