Looking for Roses that are TRULY Resistant to Balck Spot
Nininanoo
22 years ago
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littledog
18 years agolast modified: 9 years agowell_rooted
18 years agolast modified: 9 years agoRelated Discussions
Will some roses develop resistance to black spot if not sprayed?
Comments (19)A 2011 USDA Beltsville, MD scientific paper supports the findings of the strawberry paper presented earlier in this thread. Title:Effect of cultural system and storage temperature on antioxidant capacity and phenolic compounds in strawberries Authors: Peng Jin a,b, Shiow Y. Wang c, Chien Y. Wanga,*, Yonghua Zheng b Authors affiliation: a Food Quality Laboratory, USDA-ARS, Beltsville, MD 20705, USA b College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China c Genetic Improvement of Fruits and Vegetables Laboratory, USDA-ARS, Beltsville, MD 20705, USA Abstract: "The effects of cultural systems and storage temperatures on antioxidant enzyme activities and non-enzyme antioxidant components in two cultivars (âÂÂEarliglowâ and âÂÂAllstarâÂÂ) of strawberries were investigated. Fruit samples were hand-harvested from organic and conventional farms in Maryland, USA, and were stored at 10, 5 and 0 ðC. The results from this study showed that strawberries grown from organic culture exhibited generally higher activities in antioxidant enzymes. Moreover, the organic culture also produced fruits with higher level of antioxidant contents. Strawberries stored at higher temperature (10 ðC) had higher activities of antioxidant enzymes and antioxidant capacities than those stored at lower temperatures (0 or 5 ðC), in both organic and conventional cultural systems. In conclusion, strawberries produced from organic culture contained significantly higher antioxidant capacities and flavonoid contents than those produced from conventional culture, and even though low storage temperatures retarded decay, they also reduced the increase in antioxidant activities." Here is a link that might be useful: USDA paper...See MoreLooking for bright pink with black spot resistance
Comments (2)Buck rose: Country Dancer, or Earth Song? So far, for me, Country Dancer is more prolific; both appear to be disease resistant....See MoreAre these roses truly blackspot resistant?
Comments (22)As the person at Newflora who does the ratings there is so much to say about disease resistance. You are right it is hard to test every location. We know there are at least 12 races of black spot and I think probably more across N. America. The other things I find to affect disease resistance in a particular plant is stress whether it be drought, lack of fertilizer, a hard winter, wrong soil pH can also affect the disease resistance. I would compare it to a person being more susceptible to colds when they are run down or stressed. In one of the threads on this site I mentioned Brothers Grimm had shown black spot in the Midwest but we have never seen it any other place in the world. I can't explain it, but I do believe it had a very bad black spot in this trial location. What we do before we introduce a rose is send it to trial sites across N. America to see the disease tolerance. Kordes also widely tests the roses in Europe. We run our trials with no sprays and try and promote disease by leaving diseased plants in the field and overhead watering to promote black spot. I have strong mildew at my trial site in spring and again in fall. We work very hard to try and deliver roses with excellent disease resistance. That said as we work hard at creating disease resistance roses the fungus is also busy mutating and changing. I don't think we will ever create a perfect rose or if we do the fungus will eventually find a way around it. Realistically I think the way to look at roses is to see if it can maintain health through the summer and maintain at lease the upper 70 percent of the foliage until fall with no spray. In fall as roses start to shut down for the season there may be more disease, but with just a little time left I don't worry about this. The test is that you enjoyed the rose and did not need to spray fungicides to have a great looking rose for the season. A few leaves with spots should not be too great a factor. With mildew if there is a little leaf wrinkle I know it has some susceptibility. but it is keeping the foliage and will be all right when climate conditions change. If it destroys the leaves and ruins the buds, well then it is not something we would introduce. The reason I follow this site is to get feedback on how the roses are performing in a wide geographic area. I learn a lot and if I have something helpful to add when there are questions I do comment. I learned something on this post because Beth's report on Savannah is the first time we have heard of black spot on Savannah. I hope it is transitory for you Beth because this is one of my favorites. Greenburgroses if you are in the south then Wedding Bells has been performing really well on disease and bloom. Plum Perfect is really doing well in the south, but I am not sure about its vigor in the north. We have not finished trials. We introduced PP for southern gardens as part of the Sunbelt series. Poseidon is healthy in the south although tending to be tall. If you buy it you should prune it hard (to 2 feet) in the late winter to maintain it at 3.5'. Savannah is doing well in the south (except at Beth's house :) ) It won awards at Biltmore no spray competition and also did well at the trail at thee U. of Georgia Athens. Wishing very good results with your rose garden....See MoreWhat are your most floriferous black spot resistant roses-please share
Comments (46)Part of my post disappeared :(. Diane earth angel is a slow re bloomer and not super productive. In that image I have 3 planted together. I am hopping in the future it will improve. Desdémona on the other had does produce hundreds of blooms. Ohhh vapor I wish I could send you one of my huge monsters. I cut down desire down to the ground this winter and is back to 7 feet tall canes. I meant for Desdemona to cascade over dark desire’s red blooms with lichfield angel on front. Now I have dark desire smothering everything on its path and can’t even see Desdémona unless I circle to the back of the bed. I have trouble making things happen how I imagine it....See Morechathamcapecod
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