Blackspot resistant roses
Sara-Ann Z6B OK
8 years ago
last modified: 8 years ago
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jim1961 / Central Pennsylvania / Zone 6
8 years agotowandaaz
8 years agoRelated Discussions
battleing blackspot
Comments (46)Moril: I appreciate your raising question about how much nitrogen tree bark robs compared to others. There's this government website http://www.fpl.fs.fed.us/documnts/fplrn/fplrn091.pdf which makes a big issue out of tree bark and nitrogen deficiency by suggesting addition of 25 ammonia, or 80 lb. of urea, or 100 lbs. of ammonium nitrate or ammonium sulfate. On the other hand, there's this Colorado University Extension that says tree bark doesn't rob the soil that much nitrogen, since it's a very slow decomposition. Then there's another University Extension that recommends stable owners to add nitrogen to their horse manure mixed with hay, so that they can get rid of their manure easier to the farmers. My take: Horse manure on hay breaks down faster that big chunk of tree bark, so nitrogen deficiency is more of an urgent issue with aged horse manure. My main concern with tree bark is NOT the nitrogen issue (I have to supplement NO MATTER what with my poor-nitrogen alkaline clay). My concern is the fungus issue. Check out this website from Pen. State University: http://www.personal.psu.edu/users/d/d/ddd2/ The above links is about artillery fungus on decayed wood bark that gets on white cars parked nearby. That's the same concern that the British paper wrote about tree bark mulch contributing to blackspot in roses. I take www.greenharvest.com recommendations of using number choice 1) oat straw and 2) pine park with a grain of salt: I used pine bark in the past with my 15 roses and had the worst blackspot, despite chemical spray. This website makes a good point about potassium deficiency as making the rose more prone to blackspot....See MoreBlackspot resistant roses other than Knock-Outs
Comments (26)Far different zone and growing conditions than yours and all of my roses are own root as root stock does not do well for me. I had close to 350 rose bushes here. When I decided to go no spray it took two years to eliminate all take were not healthy. I was left with mostly Kordes, Ping Lim (Easy Elegance), Flower Carpet and a few misc. The midwest has the highest humidity index after the gulf states in the US. So good disease pressure here. However we don't have rust or downy mildew issues here. That I know of. I've had my kordes roses for ten plus years and many have been renamed.Ex.my Petticoat Fairy Tale is a gorgeous apricot orange pink blend. Size is 4' by 4' here starting with no cane in spring. Petticoat is now sold as a white rose. I only ordered the Kordes roses that have won an ADR that said none have ever had any disease at all. As a whole they grow much larger than their stated average size at least here in my yard. Buy Kordes adr roses you won't regret it. Ping Lim roses are sold own root. Don't know if you can get them on fortuniana stock if thats what you need.The best of the best is sunrise sunset (shrub type). Size here is 4' by 8'. All that I've tried are disease free but some have lacked in vigor. Other disease free roses in my yard are- Gartendirektor Otto Linne Kateryna Betty Prior Easy Does It Roserie de l'Hay Cape Diamond- don't prune it or will throw wild growth from every dormant bud on cane- ask if you wish to know more Flower Girl Home run White Out- thou I have heard some have problems mine has been perfect-own root don't now that it matters Pretty In Pink Sunshine Daydream Quietness...See MoreJournal of Growing My Gemini Tree Rose Indoors
Comments (7)Thanks Krista, Karl, HoovB, Petaloid, John and Jim for all your thoughts and input...Karl yes, I am hoping that Gemini will deepen in its colors at least with the leaves, but ugh, Gemini has about as much wisdom and common sense as I have. Instead of storing up chlorophyll in its leaves and tender stems, being patient, strengthening and taking its time to develop and mature, Gemini is trying to send up another flush immediately. 10 p.m. on New Year's Eve: A baby blossom bud emerged 3/4" above its sheath of leaves (fully extended "neck"). I predicted 4 other buds as well, because I started seeing the tell-tale signs of the 2 5-leaflet tender enclosed "prongs". As soon as I see a split 2 5-leaflet stem fork outwards, usually a baby bud is nested within the "sheath". New Year's Day Another 4 flower buds emerged. I give Gemini its 2nd Gardenville feeding (got delayed by a few days). January 2nd I have another one flower bud nested and emerging, and 6 very suspicious pronged stems to deal with. Total count will be 12 flower buds so far (6 definite). Sadly my house is way too large and drafty for me to do any humidity control via Karl's suggestion so all I can do is cross my fingers and shake my head at this craziness. I am expecting blackspot to strike any moment because it is a pattern of Gemini to get sick whenever it goes through a spurt of blooms. I dare not decrease the h. oil/Greencure at this point like I originally intended. Predicted survival of buds into mature blooms is only 20% at this time. Leaves and stems are way too soft and pale to support blooms!!! Why Gemini is trying to send up another flush is beyond me! Gemini is as kooky and insane as me (sigh-I think it is a "mind-reader" LOL). Jim, still no problems with spider mites... John, I have a fragrance-sport Gemini that consistently had a wonderful scent while growing outside and that is the one HUGE thing that I miss terribly. But my sport Gemini is also a BS magnet-Sport as well. Gemini is supposed to be known for its health and beauty, but mine flunks the BS test whenever it goes through a flush...It gets extremely sick and ugly, but it is also a fighter rose as well and a few weeks after the flush it will make another comeback. Tomorrow I will post a sample photo of the baby flower buds. P.S. Eluane gives everyone a puppy kiss. She is glad HoovB and Petaloid are mentioning her instead of stupid Mama fussing over some messy rose, LOL!...See MoreBlackspot: organic prevention and remedies.
Comments (36)I'm organizing the info. for future reference ***** Yes to black-peat humus as topping to buffer acidic rain, plus NPK of at least 10-10-10 for pots. Tested black-peat-humus plus horse manure (both alkaline) in 2011 for roses in the ground (clean past Nov), plus black-peat-humus potting soil (mixed with alkaline sand) for roses in pot in 2015 (Perle and Cloudert Soupert, both healthy until snow). Humus can hold the equivalent of 80–90% of its weight in moisture, and therefore increases the soil's capacity to withstand drought conditions.[32][33]The biochemical structure of humus enables it to moderate – or buffer – excessive acid or alkaline soil conditions.[34]https://en.wikipedia.org/wiki/Humus Above pic. is Perle d' Or, own-root in a pot with snow, winterized in my dark & unheated garage. Pic. taken the day before Thanksgiving, Nov. 25, 2015. It's 100% healthy, no pests, no diseases. Things I did right this year: Own-root from a tiny-rooting is wimpy & small. So put a 4" layer of soil mixed with alfalfa pellets ON TOP. That for constant release of nutrients, plus to lock in moisture. This was wet year. To buffer acidic rain, I put 1/4 cup of pea-gravel, for slow-release of calcium & magnesium & trace elements. Advantages: Pea gravel magnifies the fragrance. Pea-gravel scatters out and doesn't block out rain like big-chunk red-lava rock. Pea gravel is alkaline, so it neutralizes acidic rain. It rained so much I didn't bother with SOLUBLE fertilizer. I followed U. of Kentucky success with Omega 6-6-6 (blood meal, bone meal, sulfate of potash). I put high-bone meal fertilizer NPK 4-10-7 in the potting mix. Also topped with 1/2 tablespoon sulfate of potash, 1 tablespoon gypsum, and 2 tablespoon blood meal. This lasted for 2 weeks of constant rain....See MoreUser
8 years agolast modified: 8 years agosmithdale1z8pnw
8 years agodublinbay z6 (KS)
8 years agolast modified: 8 years agovasue VA
8 years agolast modified: 8 years agoSara-Ann Z6B OK
8 years agolast modified: 8 years agoRachel Cross- Harder
8 years agoRachel Cross- Harder
8 years agoAquaEyes 7a NJ
8 years agosammy zone 7 Tulsa
8 years agoBuford_NE_GA_7A
8 years agoDave5bWY
8 years agoSara-Ann Z6B OK
8 years agoenchantedrosez5bma
8 years agokentucky_rose zone 6
8 years agoKen (N.E.GA.mts) 7a/b
8 years agoJim F (Zone8/PNW)
8 years agolast modified: 8 years agoboncrow66
8 years agolast modified: 8 years ago
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dublinbay z6 (KS)