This is a public-interest archive. Personal data is pseudonymized and retained under GDPR Article 89.

Re: Bug or disease?

rosenlund wrote:
> 
> Cathy,
> <Carleen - that last question referred to the spacing of the leaves -- do
> <they look bunched up?>
> 
>  Yes, the leaves are bunched up a bit.
> 
> <kinda sounds like some rosetting there.>
> 
> What is rosetting?
> 
> <I don't vote for bugs at all -- i vote for a virus, especially since it
> sounds
> like you got all these grafted from the same mother plant, which is how
> we spread it.>
> 
> I suspected virus, also.
> 
> <Sounds like rose spring dwarf. prune it with a shovel.>
> 
> What is 'rose spring dwarf'?
> I have lot's of rose books with pretty pictures, but as I
> can see I am going to need a book with some knowledge
> of bugs and disease. Or throw out anyone [roses] that
> gives me any trouble. [somewhere in the middle]
> Can you beleive I've actually owned roses for over 16 yr.
> course only the hardy and robust made it. Planning to
> be more attentive and I'm getting an eye full. Ain't that
> how it happens!
> 
> Any suggestion on a good book?
> 
> Carleen
Dear Carleen -
I happend to have, "Compendium of Rose Diseases," on my desk when your
e-mail came up. It is by the American Phytopathological Society, and you
can find them on the net. I think it retails for about $39, and is
intended for professionals, but I see no reason why you can't make use
of it. The pictures are superb, the language descriptive and complete. 
And, the term "rosetting" just means in a bunched-up swirl. "Rose Spring
Dwarf," from the book:  "is found incommerical nurseries, landscape
roses, and public rose gardens in California. Characteristic symptoms,
produced when leaves first emerge in the spring, include rosetting or a
"balled" appearance in the new growth following bud break. The leaves
are recurved or very short, are borne on arrested shoots and show
conspircuous veinclearing or a netted appearance (my note -- looks like
the whole leaf is pretty pale). Shoot elongation may be delayed for two
months, and newly developing leaves may be symptomless. Infected plants
may remain symptomless during the summer and fall, but plant vigor is
reduced and some mild epinasty, vein-clearing, or both may show on new
growth in the fall. Branches often develop a sizxag growth appearance.
the causal agent of rose spring dwarf is unknown and does not appear to
spread in nature. The disease is not sensitive to temperatures used for
thermal therapy. The best control measure is to rogue infected plants."
Cathy.
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index