RE: rosemary disease (was: Plant people)

Okay - I'm dying of curiosity.  And, I'm thinking of a small rosemary hedge
of my own, in LA (south facing hillside, north of the river, limited fog),
nothing approaching the magnificence of Alessandra's.  Is the crown gall
agent common in California? The site Ryan provided said it was worldwide,
carried on grape cuttings, although only a very few strains are
pathogenic...


Reference bits:
Ryan wrote:

In light of the information at this site:
http://helios.bto.ed.ac.uk/bto/microbes/crown.htm  I would certainly
recommend
looking into the biological controls you mention. BTW, thank you for
bringing
this up. I have long been fascinated with the interaction between plants and
soil life, and that site above appears to have a wealth of information. I
might
not have located it without the your post.

Regards, 
Oxnard Plain (SoCal) 34.5N

"Vinciguerra, Alessandra" wrote:

> Dear Medit-gardeners,
> Some time ago I wrote about the mysterious disease that was slowly killing
> my rosemary hedge. I had samples of the infected plants analyzed at the
> local Plants Pathology Agency, and the sad response is that my plants are
> infected by a bacterium, the Agrobacterium tumefaciens. This  is commonly
> known as the crown gall agent. The damned microscopic  organism
apparently
> is able to  transfer part of its  DNA to the (unwilling) guest plant....




-----Original Message-----
From: "Seán A. O'Hara" [s*@support.net]
Sent: Thursday, October 25, 2001 3:41 PM
To: Kgkg101@aol.com
Cc: medit-plants@ucdavis.edu
Subject: Re: rosemary disease (was: Plant people)


Kathleen -

You might have missed the discussion about Alessandra's diseased rosemary 
hedge.  Jan's comment was in sympathy rather than judgement.  I also saw 
the hedge when it was in better shape and it was truly beautiful, 
especially against the tuscan yellow of the Academy building itself!

Seán O.

At 06:28 AM 5/30/2001, Vinciguerra, Alessandra wrote:
>Dear group,
>some plants of my 100 meters long rosemary hedge are showing symptoms of a
>disease I am not familiar with. The bark, on the branchlets, is developing
>areas with disordered, excessive tissue, that looks like cork. All parts
>above this "cankers" die , because obviously this  anomalous growth blocks
>the sap. Whole parts of the infected plants are collapsing. Unfortunately
>this reminds me very much of a similiar disease that attacks oleanders and
>sometimes olives,  due to a bacterium called pseudomonas. Any idea of what
>my rosemaries are suffering from, and above all, how do I fight it?
>Thanks a lot,
>Alessandra

h o r t u l u s   a p t u s     -    'a garden suited to its purpose'
Seán A. O'Hara            fax (707) 667-1173         sean@support.net
710 Jean Street, Oakland, CA 94610-1459, U.S.A.
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index