消灭玫瑰黑斑的土办法 （ZT）
Climbers:
1. New Dawn -Some BS and Cercospora in the fall, but still thrives, blooms and grows well.
2. Awakening - the same comment as New Dawn
3. Parade - more BS then New Dawn, but still grows and blooms well. Doesn't loose it's vigor becayse of BS.
4. Illusion - very little BS, great climber. Blloms a lot, fragrant
5. Alberic Barbier - once blooming rambler, healthy as a horse
6. Mermaid - not a spec of desease
7. Westerland and Autumn Sunset - loose abourt 50% of their leaves. Still bloom and grow
Repeat blooming roses:
1. Knock Out -(as well as Pink and Blush) no desease
2. Darlow's Enigma - almost no desease
3. Carefree Sunshine -less then 10-15 % leaf loss. Blooms and grows well.
4. Morning Has Broken - less then 10 % leaf loss, great rose
5. Earth Song - Similar comment to Carefree Sunshine
6. Mutabilis - approx 50% leaf loss but still very vigorous and blooms non stop. Never looks ugly.
7. Lyda - The same comment as Mutabilis
8. Safrano - 50% leaf loss, still blooms, but a lot of winter dieback
9. Jaques Cartier - very little desease
10. Marie Pavie approx 30%-40% leaf loss from BS, still blooms and grows.
11. Belinda's Dream - some BS (20-30%). Blooms and grows well but a lot of dieback every winter and first flush almost always balls.
12. The Mayflower - some BS. Gets better with age. Blooms and grows well.
13. Souvenir de la Malmaison - get BS (30-40%) but blooms and grows well
14. Roseraie de l'Häy - no desease
15. Some other rugosas (old varieties with typical rugosa leaves, not morden rugosa hybrids)
16. Arethusa - get BS (30-40%) but blooms and grows well, some die back
17. La Vesuve- get BS (30-40%) but blooms and grows well, some dieback
18.Georgetown Tea -get BS (30-40%) but blooms and grows well, some dieback
Once Bloomers:(There are many healthy once bloomers for MD, they grow and perform absolutly wonderful here, really carefree, highly recomend)
1. Konigin von Danemark Alba, no desease
2. Ispahan - Damask , no desease
3. Charles de Mills -gallica, no desease
4. Belle de Crecy -gallica, no desease
5. Belle sans Flatterie- gallica, no desease
6. Alice Viena -gallica, no desease
7. Jeny Duval -gallica, no desease
8. Tuscany Superb - gallica, no desease
9. Duc de Guich - gallica, no desease
Many other gallicas, I just leasted my favorite ones.
10 Felicite Parmentier -some BS (not much) and PM (when young), but still vigorous, blooms have unbelievable fragrance, looks good
The spray of 1 tbsn grocery store apple cider vinegar per quart of water has done WONDERS for my poor spotty Madame Isaac!
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I tried this and it seems to have worked. I only grow roses that aren't susceptible to BS anyway but I almost always get a little this time of year. So last week I mixed up 2-3 tablespoons of white vinegar (didn't have cider) with a gallon of water and so far the BS appears to be stopped dead in it's tracks. I'm very pleased.
I have used this recipe after finding it at one of your rose forums last year and it has worked wonders!!!
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3 tablespoons of Apple Cider Vinegar to 5 litres of water. I couldn't begin to tell you how impressed I was at the results! Double Delight, which used to get riddled with blackspot looked lush and healthy with no b/s to be seen!
Also as an experiment I sprayed on the vinegar spray and waited to see how long it would take for more blackspot to appear, and it took approximately 3-4 weeks for the more blackspot prone roses and even longer for the healthier ones,( the Austins ) if at all!
As for only spraying in the early morning or early evening, I found that that didn't matter either. I sprayed during the middle of the day ( in spring, mind you! ) without any burning.
Another method I have adopted now is to spray with the vinegar spray and then alternate with the milk spray - 1 part milk to 7 parts water. Works a treat! I'm so happy to find such a cheap and harmless solution, and by harmless I mean that you can get away with having your skin exposed, but I still wear sunglasses as the vinegar solution could burn your eyes if it blew into them I suppose! All the best and happy gardening!
Here's another method I adopt to occasionally. When your rose leaves are showing sign of deficiency, like yellow leaves etc, simply spray on a solution of either liquid seaweed and water or fish emulsion and water and the leaves bounce back within the week of spraying. I use a small hand sprayer that is about 450 mls. Add only half a teaspoon of the liquid seaweed or fish ..... that's all you need! And that's all from me ......... over and out!
:-D
| Do not mix the vinegar and the baking soda when applying to roses for black spot. Logically, it seems correct. But as alluded to above, each will render the other ineffective. From, "Growing Roses Organcially" by Barbara Wilde: "Black spot spores need a near neutral pH to germinate, so anything you can do to lower the pH on the surface of your roses' leaves will help prevent the disease............." Hence the suggestion for using vinegar. Also: "Before air pollution control laws, black spot was less common in urban areas because acid rain (caused by sulfur containing pollutatnts disolved in rainwater to make acids)." Hence the effectiveness of sulfur. And: "........For instance a solution of skim milk applied to rose foliage will do a pretty good job of inhibitin g black spot. The theory is that as the milk spoils on the leaf surface, lactic acid and casein are produced. Lacitic acid lowers the pH, while the casein helps bind the milk solution to the leaves." I don't know if cream is better for black spot than skim milk---I know vitamin E is found in the fat of milk, I'm betting on the side that lactic acid is not since her suggestion is for skim milk. And she suggests a ration of 9 parts water to one part skim milk. Also: "At the other end of the pH range, sodium bicarbonate prevents fungal diseases by increasing the pH on the leaf, making it more alkaline." She suggests 1 tablespoon per gallon of water, with a light hort. oil or veg oil, along with a squirt of mild dish soap to help it stick to the leaves. She also warns that the sulfur products "adversely impacts some beneficial insects and mites, so consider it a last resort in your disease management program." |
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