[Arid_gardener] Lady Banksia problem

[Steve Sheard]

Dear Bill,
There are not many roses that are not being affected by our +115 temperatures. Most of the browning on roses at this time of year is not from mildew or rust (I have yet to see rust in the valley). My guess is that the browning is from "salt burn" due to a high concentration of salts in the soil and maybe the bush not getting enough water. 
To reduce the salts you need to throughly soak the bed to wash the salts down below the root zone, and then leave it a day or two to dry. Dig down and see how wet it is.
I am watering my roses every day with these very high temperatures. When they drop back to 110 F I will go back to every second day. A rose on the east side should need about 4 gallons at a watering. 
Visit http://www.roses4az-mevrs.org/ for more info on growing roses in the valley.

Regards
Steve Sheard
(Not a Master Gardener, A consulting rosarian with ARS)


----- Original Message ----
From: Bill Woody <billw-9 at msn.com>
To: arid_gardener at CALS.arizona.edu
Sent: Monday, July 9, 2007 7:47:17 PM
Subject: [Arid_gardener] Lady Banksia problem


Our Lady Banksia vines are getting browner.  They are growing on trellises on the east side of a concrete block wall so they are shaded after about 1 pm.  I have sprayed them with a dilute solution of baking soda and soap to kill mildew and stop rust but they continue to decline.    Might they need shading for a good portion of the morning as well in this fierce heat?  Or what do you experts suggest?
 
Bill Woody


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