GardenBanter.co.uk

GardenBanter.co.uk (https://www.gardenbanter.co.uk/)
-   Roses (https://www.gardenbanter.co.uk/roses/)
-   -   How, when and why to apply dormant spray. (https://www.gardenbanter.co.uk/roses/564-how-when-why-apply-dormant-spray.html)

Allegra 03-02-2003 07:52 PM

How, when and why to apply dormant spray.
 
Hello everyone,

Different strokes for different folks, but spraying dormant spray to protect
the roses is a good practice whether you are in Alaska or in Florida.

The reasons to spray roses with dormant spray are various and different in
any case but I venture to say that they all have a common cause: to ensure
that the plants are healthy and free of both fungal diseases and insects.

Most spores from fungal diseases will overwinter both in leaves and debris
at the surface of the rose. All the good and well established cleaning
practices can be for naught if some pathogens are present either under the
leaves left
on the bushes or in the ground, regardless of where you are. They are the
trouble in the making for the coming year for the roses (and you).

Copper compounds are used as a fungicide on dormant roses. The two most
common products are copper sulfate and Bordeaux mixture, a copper sulfate
and hydrated lime mixture. Copper has a toxic effect to many fungi and
algae. When applied as a dormant spray, these copper compounds help to
eliminate overwintering pathogens. Spray roses with dormant spray using the
same spray technique used on trees and hedges: up from the bottom, then down
from the top.

Horticultural oil is the other material that you could use in a routine
dormant spray program. The dormant spray oil actually suffocates insects
that overwinter on roses and has a similar effect on insect eggs that may be
present. Both horticultural oil and copper compounds can be purchased from
your nursery or as we do, from a nearby feed store that provides for farm
needs. Frequently, the copper and horticultural oil mixture may be applied
at the same time. Follow label directions carefully and wear protective
clothing when applying pesticides.

If you want to have a plan for February here is a suggestion:

Apply dormant spray as indicated above starting at the bottom of the rose
and coming back from the top. Make sure to spray around the base of the
plant
as well to catch any "stray". We strip our roses early on in January by
doing maybe 10 to 20 every day until the whole garden is done. By January
normally there isn't much to strip (take that back for this January) and
clean very well around the beds or pots. The first application of dormant
spray (Bordeaux) is done then plus a spray of Wiltpruf and we check the
ground for any kind of trouble. This is the time when we also apply
pre-emergent weedkiller. You are always grateful to remember this in June
;)

In February we again make a second pass with the dormant spray to make sure
that anything that survived the first spraying is taken care of by the
second. It sure helps with all fungal diseases and we have seen very little
insect damage on the roses, except the holes of the carpenter bees and those
are welcome in our garden. For those who are not in favor of using
"pesticides" here is a suggestion :

" The winter season is the time to apply dormant oil sprays to plants, for
the control of insects and disease. Covering the dormant stems of a plant
with a highly refined oil such as Cookes Dormant Oil Spray suffocates
overwintering insect eggs and fungal spores. Before you spray make sure to
clean up the fallen leaves around your plants and remove any left over fruit
that may be still hanging on your trees. Roses can also benefit from the use
of horticultural oils in the control of black spot, powdery mildew and rust.
Powdery mildew can be effectively controlled by using a mixture of 2 Tsp. of
Baking Soda with 2 Tbs. of Horticultural Oil in 1 Gallon of Water."

We personally continue to stick to Bordeaux because the above formula did
not work very well for us, but this is black spot, rust, mildew, you name it
country.

Here is a link with some info about dormant spray and its uses.
http://www.sheridannurseries.com/Gar...3mainframe.htm

Good gardening everyone,

Allegra




R & L Porter 09-02-2003 04:05 PM

How, when and why to apply dormant spray.
 

"Allegra" wrote in message
news:CLz%[email protected]
Hello everyone,

Different strokes for different folks, but spraying dormant spray to

protect
the roses is a good practice whether you are in Alaska or in Florida.


SNIP

Here is a link with some info about dormant spray and its uses.
http://www.sheridannurseries.com/Gar...3mainframe.htm

Good gardening everyone,

Allegra



Allegra,

thanks for taking the time to give all of that information. It is
appreciated.

Laura -- I am following the links..





Allegra 09-02-2003 10:55 PM

How, when and why to apply dormant spray.
 
Laura wrote:

Allegra,

thanks for taking the time to give all of that information. It is
appreciated.

Laura -- I am following the links..


Hello Laura,

You are most welcome. To make your life a bit easier let
me tell you the BH bought Polysul Summer and Dormant Spray
Concentrate by Lilly Miller (www.lillymiller.com) at the farm
co-op and this is what it is good for in both roses and fruits:

Powdery mildew, scab, Aphid eggs, Mites, Scale, Anthracnose
(the bane of my existence here!), rust, blackberry mite (that
loves to visit the roses as well) and brown rot in the ornamental
cherries, plus yellow rust on just about any other vine or berries.

Hope this helps and makes the chase shorter ;)

Allegra




All times are GMT +1. The time now is 05:36 AM.

Powered by vBulletin® Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
GardenBanter