tulip color breaking

Kenneth Hixson khixson@nu-world.com
Mon, 02 Feb 2009 10:08:00 PST
Jim McKenney wrote:
> In a conversation during  EWSW09 the topic of color breaking in tulips came
> up. I was assured that it was caused by mycoplasma, not viruses.

	This is interesting.  Lily growers have been blaming Tulip
(Color) Breaking Virus for infecting lilies with virus for years,
and you often see the advice to not grow tulips near lilies.
Can't swear to it, but thought I saw pictures of TBV particles
taken with an electron microscope, in some of the old lily yearbooks.
Not all color breaking in tulips is caused by virus, some of
it is "genetic", with no virus particles visible under an electron
microscope, so perhaps mycoplasma has a role, but I haven't
seen anything on it.
	Color breaking occurs in a variety of plants, and is not
always caused by virus.  Camellias can have virus induced variegated
flowers, but not all variegated flowers are virused.  Evergreen azaleas
can have striped/sectored flowers, flakes, picotees, blotches, etc.
Dianthus/carnations also can show the same variations in flower color,
apparently without virus.  Should they now be investigated for 
mycoplasma?  Color breaking may also only show under certain conditions,
such as when the plant is stressed.
	Variegated foliage can be virus induced, but not all
variegated foliage has virus particles present.
	As we learn, we have to "unlearn" some of what we learned
when we were younger.

	Because I'm ignorant, what is EWSW--the 09 part I can guess.
Eastern Winter Study Weekend of the ARGS?


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