Virus in Crocus

anthony goode
Sun, 19 Oct 2003 13:45:29 PDT
As a partial answer to Jane McGarys' enquiry about a damaged Crocus
pulchellus, I have posted the insert below plus links on the wiki
Crocus page.

"Crocus are susceptible to virus disease. This is usually visible in
the flowers. This distortion may take the form of twisted petals,
streaking (as in tulip fire,) sometimes the flowers are depauperate
and fail to open properly. The virus also reveals itself as light and
dark blotching in the foliage which is most visible when the foliage
first emerges. The pictures here have been manipulated to exagerate
the streaking in flower and foliage to make it more apparent. (Massive
hike in contrast levels does this.)……
Here is one with distorted petals…
The vectors are aphids which find refuge especially on the backs of
the leaves. "

I would add that only a very few of my plants exhibit signs of virus
such as these and those that do are always removed and quarantined for
further evaluation - which usually results in a decision to destroy
the plants.

Crocus serotinus and Crocus kotschyanus seem to be most susceptible
but maybe this is because I grow so many variants of each.  Plants
grown under glass are much more susceptible, as are overcrowded
plants.  Both of these situations give shelter to aphids.

I suspect that Janes plants are simply victim to some kind of
mechanical damage but a very close examination of the flowers and
foliage (when it emerges) should clear up any doubts.

Tony Goode.  Norwich UK. Mintemp -8C

More information about the pbs mailing list