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Old 03-02-2003, 09:19 PM
Allegra
 
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Default 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





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Old 04-02-2003, 07:26 PM
Bob Bauer
 
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Default How, when and why to apply dormant spray.

Allegra said:

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.


Don't forget that there are many areas of the world that do not have
problems with blackspot, rust and mildew at all.

And therefore it is completely pointless for people in these areas to
spray their roses with lime sulpher oil or any other winter applied
fungicides.

To the best of my knowledge, FEW IF ANY rose growers in my area do it
for example. It just isn't necessary for people in dry air climates.

Your advice is good in areas that have bad fungal infections, but
realize that that is not everywhere.

Bob Bauer
In the Arid Western USA

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Old 04-02-2003, 08:03 PM
Allegra
 
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Default How, when and why to apply dormant spray.

Bob said

Don't forget that there are many areas of the world that do not have
problems with blackspot, rust and mildew at all.

And therefore it is completely pointless for people in these areas to
spray their roses with lime sulpher oil or any other winter applied
fungicides.

To the best of my knowledge, FEW IF ANY rose growers in my area do it
for example. It just isn't necessary for people in dry air climates.

Your advice is good in areas that have bad fungal infections, but
realize that that is not everywhere.

Bob Bauer
In the Arid Western USA



I guess in the first message (the reason why I placed the second) for some
unknown reason this paragraph was missing (it can be seen in the answer
that went as an answer instead of the message again who knows why):

" 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. And we spray the second and third time to smother egg sacks and
larvae.

Allegra


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Old 04-02-2003, 08:04 PM
Allegra
 
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Default How, when and why to apply dormant spray.

Tell that to attbi, who first said the message was not available
and then placed the second message as a response! ;)

How are your roses? Our are swimming, (literally, we have been
drenched for the past two weeks and this is one time we are
so happy about digging down to China to ensure proper drainage
otherwise here in clay paradise they would floating by the sidewalks)
To comfort us there is Eugene the bad boy blooming in the garage.
Spring is coming, Spring is coming, Spring is coming....

Allegra


"Larry Blanchard" wrote in message
...
In article N9A%[email protected], says...
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.


We heard you! We heard you! grin

--
It's turtles - all the way down!





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Old 04-02-2003, 10:09 PM
Radika Kesavan
 
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Default How, when and why to apply dormant spray.

Allegra wrote:
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.


Allegra, I am confused, so please help. I see three postings with this
heading from you - all dated 3rd Feb, the first one posted at 11:52
a.m., the second at 11:57 a.m. and the third posted at 12:19 p.m. Which
of these three, if there is only one, that contains all that you wanted
to say on this subject? If you would please tell me, I will read that.

I see Bob responding to one of these, and our own climate is between
yours and his; we seldom see blackspot (and even if we do, that is not
so bad as to kill any rose here), and rust comes at the end of the year
- but it is mildew heaven if we are unwise about selection or cultural
practices. I have dormant sprayed with sulphur before I realized I get a
rash from being exposed to it, and these days, I do jojoba oil or neem
oil dormant spray. But I spray only the most troublesome of roses, and
these are only one or two. Compared to where you grow roses, this place
makes it all easy enough for us mostly all on tis own.

--
Radika
California
USDA 9 / Sunset 15

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