Messages posted to thread:

From:Date:Zone:
carol17-Mar-02 10:35 PM EST 5b   
Ian 18-Mar-02 10:16 AM EST 5b   
George griffin18-Mar-02 07:31 PM EST 5b   
carol19-Mar-02 08:40 PM EST 5b   
Ian19-Mar-02 09:35 PM EST 5b   
George Griffin20-Mar-02 09:01 AM EST   


Subject: dormant oil spraying
From: carol
Zone: 5b
Date: 17-Mar-02 10:35 PM EST

When would be the best time to spray with lime sulpher/dormant oil mix? Some of my roses have large leaf buds forming already but we are still getting below freezing temps at night.


Subject: RE: dormant oil spraying
From: Ian
Zone: 5b
Date: 18-Mar-02 10:16 AM EST

Hi Carol, Dormant oil sprays should only be used on clear,bright days when the temperature is above 45 degrees F. and not likely to drop below freezing for at least 12 hours or so. This will give the oil time to "dry" on the vegetation. It is used to coat the eggs of insects to kill them before hatching. Beware of the Lime-sulphur...it can burn tender vegetation and will stain the paint or mortar around your house. Today's dormant oils are pretty effective in controlling insects. I personally wouldn't use the Lime-sulphur. Instead, I would wait until you see that you have a pest before spraying it. Try to resist fighting nature when you garden. Cheers....Ian


Subject: RE: dormant oil spraying
From: George griffin
Zone: 5b
Date: 18-Mar-02 07:31 PM EST

There is a narrow window of opportunity indeed with the time application for dormant oil. Our Spring weather seems to be so erradic that it can be difficult. If I get a 24 hour dry period where the temps don't fall below 0C. at a time before the buds leaf out I take the opportunity to spray the limed Sulphur on plants that are tend to get fungal problems. Otherwise I just use the oil on plants with persistent insect problems. I have some Rugosa Roses that have bugs on them every year but the bugs balance themselves out. The lady bugs take care of the aphids ( all in good time ) I don't spray those as it would kill off the beneficial bugs. Even with so called " organic " or environmentaly friendly solutions my creed is to use the least amount necessary to establish a balance when it seems necessary. Less material, less work , less problems.


Subject: RE: dormant oil spraying
From: carol
Zone: 5b
Date: 19-Mar-02 08:40 PM EST

if I want to control mainly fungal problems i.e. blackspot, should I forget the dormant oil and concentrate one the lime sulpher only, if so when do I apply this. Thanks for all your helpful information.


Subject: RE: dormant oil spraying
From: Ian
Zone: 5b
Date: 19-Mar-02 09:35 PM EST

Dear Carol,

Personally, I do not use lime-sulpher. For black spot and mildew, I use either Benomyl or Funginex which are "systemic" fungicides. They are absorbed into the plant to protect it. You have to apply this every 7-10 days throughout the season. You can also use a powdered sulphur dust for roses. This will control mildew, black spot and red spider mites. But because the powdered sulpher is not a systemic, you will have to apply it more frequently, depending on the weather etc. As for the insects, I generally keep an eye on my roses and only spray them when needed. That way, you are not needlessly killing the beneficial insects or bees.


Subject: RE: dormant oil spraying
From: George Griffin
Zone:
Date: 20-Mar-02 09:01 AM EST

Do not use Limed sulphur alone without the oil. You can purchase a regular wettable ( Safers ) Sulphur for that purpose. I have used it to control powdery mildew. My approach has been to avoid plants that have a reputation for fungal problems and go with disease resistant varities as recommended by the Dept of agriculture ( not the catalogues ) I focus on my soil culture, proper watering and air circulation with an absolute must in regards to location for proper amount of light to support vigorous growth.

If a plant should ever give me a persistent problems with fungal attacks I will use my dream shovel. My dream shovel will dig up the offending plant and allow me to dream about what wonder I am going to replace it with. I enjoy gardening more than I do chemistry. Hope this helps. Don't just go away, let me know what you do and how you made out. Just call me Curious George.


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