Help with research on potential new roses
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New House, New Garden: Starting research
Comments (17)hi, tandaina, It is confusing, but horticultural zone classifications refer to the low temperatures an area has. In my zone 8b in a mild coastal area, lows are usually not more than about 15 degrees. The teas I grow can handle the cold generally, but the kicker is that summertime heat levels are not reflected within that 8b definition. What I've found is that to do well teas need more heat than I have in most of my yard. Summers rarely reach much above 75 degrees. You can create a warm microclimate such as what Jackie is talking about and that helps a lot. Also I've found that with some of the teas that I grow, that even when they bloom, the scent doesn't develop very well. I don't grow very many Austins so have no real opinion of them. Heritage does beautifully for me, though, and I love it. Mostly I've come to love the once bloomers and the polyanthas/multiflora types, so that is what I primarily grow. I do grow several teas and baby them quite a bit, but where I am, I don't think they'll ever attain the height, the floriferousness, the scent that they did in Alabama or in Dallas. That's okay, I couldn't grow a gallica well in Texas. I don't know how much help that is, but I do wish you good luck with your garden! Gean...See MoreNew research another Koch's Postulate met for Rose Rosette Virus
Comments (1)Thank you, Henry, for helping us to understand the research and abstract. I like what you posted: 2) The microorganism must be isolated from a diseased organism and grown in pure culture." ... they comment about why they could not meet this postulate. "3) The cultured microorganism should cause disease when introduced into a healthy organism." .... They were not successful with graft transmission tests....See MoreRose disease research - reference urgently needed
Comments (4)I can't find the article, but hope somebody can. "Saprophytic" means "capable of living in dead tissue." Apparently powdery mildew is not saprophytic, the picture is unclear for rose rust, but blackspot and Cercospora spot definitely are saprophytic. This suggests that gathering sick or fallen foliage might be more helpful in the East than on the West Coast. There is a further question of how efficiently spores move from fallen leaves to healthy leaves. Apparently spores of blackspot are rarely airborne, so fallen leaves would threaten only the low-hanging leaves that could receive spatters from the ground. Picking off spotted unfallen leaves would be more helpful than collecting fallen leaves. But Cercospora spores are commonly airborne from fallen as well as sick green leaves. I've always been skeptical of whether sanitation can be effective in the garden (as opposed to the greenhouse), at least for diseases that have airborne spores. I don't try to collect fallen leaves or old mulch. But it seems logical that a solid layer of new mulch in early spring would do some good. Here is a link that might be useful: Google scholar...See MoreRecent Rose Rosette Disease related research
Comments (2)The papers did not give the authors affiliation. From other papers by some of the authors it appears that at least some of them are located at the Department of Plant Pathology, University of Arkansas, Division of Agriculture, Fayetteville, AR, 72701, USA. and some are from USDA-ARS Horticultural Crops Research Lab. Corvallis, OR, 97330, USA. see the link below. Here is a link that might be useful: link for other work by same authors....See Morerosecanadian
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