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#1
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crown rot -- please advise!
hello
phalaenopsis (i got it "reduced for a quick sale") but was sort of fair... i'd repotted into fresh bark a lower leaf had yellowed (physiologically) and 7 days ago i tried to remove the rest of the leaf (this i believe contributed to it) yesterday noted a pale leaf which fell off... (was bagged due to broken humidifier) took out of its pot lost another leaf... all the crown and most roots were sooty black (no leaf spots) also black inside the crown was NOT wet (if anything media was dry) now has 2 leafs but 1 is paling. put cinnamon all over it (plus into crown) - into tiny clay pot with sphagnum moss 3 things 1. what is the method that one puts the plant into a plastic bag wOut the pot and how much of the crown can i remove? (i'm sure that despite the condition i got it in trying to peel off the rest of the leaf -- which appeared dead really contributed to this) so don't want to make it worse by cutting (since it was not wet...) and how much of the roots do i remove? Cut them all off (there is 1 that looks barely ok) iow does one wrap the crown and 1 root in sphagnum (how much?) and seal it in a zipLock and put it in the shade? 2. how contagious is this? i threw out its old pot, all the blades and scissors; its leaves etc. and changed the paper under where it was (the other orchids next to it are bagged for part of the day depending on the weather) if its in a sealed bag or a double sealed bag can it be on the same shelf? 3. all i have is bleach, hydrogen peroxide, cinnamon, (and cinnamon oil) the book talks about antiFungals i *do* have benomyl (for trees and shrubs) if i use this how much does one use? (or what about a 5% bleach solution) i don't think i have much to lose but i want to do all i can thank you very much in advance! |
#2
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crown rot -- please advise!
Tanya writes:
a lower leaf had yellowed (physiologically) and 7 days ago i tried to remove the rest of the leaf (this i believe contributed to it) yesterday noted a pale leaf which fell off... (was bagged due to broken humidifier) took out of its pot lost another leaf... I have poor experience with any kind of closed plastic bags. Every time I have used something like that, mold and rot pops up almost immediately, almost as if I had the plant in an overly humid, cold environment without air circulation. I have a phal with a lot of foilage that has lost most of its roots. Since bagging them only has the effect of making it easier to throw the thing out later, I have potted it in a fine media and given it about 2-5klux of light, with frequent misting and a steady airflow. It seems to hold up better than it would have in a bag. I am going to lose another leaf, but there are the inklings of new root bumps on the plant. Geir |
#3
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crown rot -- please advise!
Geir Harris Hedemark wrote:
Tanya writes: a lower leaf had yellowed (physiologically) and 7 days ago i tried to remove the rest of the leaf (this i believe contributed to it) yesterday noted a pale leaf which fell off... (was bagged due to broken humidifier) took out of its pot lost another leaf... I have poor experience with any kind of closed plastic bags. Every time I have used something like that, mold and rot pops up almost immediately, almost as if I had the plant in an overly humid, cold environment without air circulation. I have a phal with a lot of foilage that has lost most of its roots. Since bagging them only has the effect of making it easier to throw the thing out later, I have potted it in a fine media and given it about 2-5klux of light, with frequent misting and a steady airflow. It seems to hold up better than it would have in a bag. I am going to lose another leaf, but there are the inklings of new root bumps on the plant. Geir thank you for replying! do you keep it with your other orchids? (i.e. is it contagious?) also did you treat it with anything? (i.e. benomyl?) would you think that sphagnum moss (high grade loose is ok?) it had been in fairly fine bark before yesterday) it (i am sure) will be losing its next to last leaf (leaving one) thank you sincerely Tanya |
#4
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crown rot -- please advise!
Tanya writes:
do you keep it with your other orchids? (i.e. is it contagious?) Haven't got a choice. I live in a small flat. If it is rot, I don't think it is transferable by air. It _is_ transferable by contact between infected parts and other plants. If you dunk-water your plants, I would water it last, and I would wash out the bucket afterwards. If you hold your plants under the tap when watering, you should be ok. also did you treat it with anything? (i.e. benomyl?) I live in Norway. The only antifungicide I can get hold of legally is cinnamon. would you think that sphagnum moss (high grade loose is ok?) it had been in fairly fine bark before yesterday) it (i am sure) will be losing its next to last leaf (leaving one) I sincerely don't know. I have never been able to save a plant that has lost its roots, one way or another. I do know that bagging doesn't work for me, but neither do many of the other tricks used by growers in warmer climates. Ray might be able to help? Geir |
#5
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crown rot -- please advise!
Tanya,
You might try putting it in a pot partially filled with foam peanuts and topped with sphagnum. Then put it in a ziplock bag with the top turned down so it stays open a ways. I have done this with phals just out of flask and into compots ala Bedford Orchids "flasking demistfied." I have not tried it to rescue a plant but who knows, it might work. It will keep the humidity up. Don't leave much if any water in the bottom of the bag. For the roots someone somewhere suggested just pulling the soft stuff the old roots and leave the "wire" to help stabilize the plant in it's new pot while it grows new roots. Good Luck, Bob |
#6
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crown rot -- please advise!
Geir,
It seems to me that most crown rot is bacterial, not fungal. I have found antibacterial soap (Tec ni care) that is used prior to surgical procedures to be effective in stopping crown rot, although the phal I saved with it never regained its former size. It grew a keike on the stem and I just couldn't get it growing. If you have a contact in the Med field maybe they could get some for you. Bob |
#7
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crown rot -- please advise!
Geir Harris Hedemark wrote:
Tanya writes: do you keep it with your other orchids? (i.e. is it contagious?) Haven't got a choice. I live in a small flat. If it is rot, I don't think it is transferable by air. It _is_ transferable by contact between infected parts and other plants. If you dunk-water your plants, I would water it last, and I would wash out the bucket afterwards. If you hold your plants under the tap when watering, you should be ok. also did you treat it with anything? (i.e. benomyl?) I live in Norway. The only antifungicide I can get hold of legally is cinnamon. would you think that sphagnum moss (high grade loose is ok?) it had been in fairly fine bark before yesterday) it (i am sure) will be losing its next to last leaf (leaving one) I sincerely don't know. I have never been able to save a plant that has lost its roots, one way or another. I do know that bagging doesn't work for me, but neither do many of the other tricks used by growers in warmer climates. Ray might be able to help? Geir thanks very much again for the reply! now both leaves are yellowing so i guess i cannot do anything else..... i appreciate your taking the time to reply and the advice sincerely Tanya p.s. i have not seen anything go this quickly and i hope never to again... |
#8
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crown rot -- please advise!
Bob Walsh wrote:
Tanya, You might try putting it in a pot partially filled with foam peanuts and topped with sphagnum. Then put it in a ziplock bag with the top turned down so it stays open a ways. I have done this with phals just out of flask and into compots ala Bedford Orchids "flasking demistfied." I have not tried it to rescue a plant but who knows, it might work. It will keep the humidity up. Don't leave much if any water in the bottom of the bag. For the roots someone somewhere suggested just pulling the soft stuff the old roots and leave the "wire" to help stabilize the plant in it's new pot while it grows new roots. i did that Good Luck, Bob thank you very much for the reply! both leaves are yellow i had repotted it (Sunday) into the culture you suggest (moss and packing peanuts) and yesterday more roots were black -- unless it can survive wOut leaves i guess there's nothing else i can do... i don't have a green thumb but i have never seen a plant go this fast (and it's been here at least 6 weeks) i really wonder whether my STUPIDLY trying to clean up the leaf last week caused this (like pulling a hangNail would???) thanks again sincerely Tanya |
#9
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crown rot -- please advise!
Tanya writes:
p.s. i have not seen anything go this quickly and i hope never to again... On the other hand, it is a reason to go fetch another one. I just got a Blc. white diamond and an Ascda. sunchart x yip sum wah. I am now a lot poorer, but the orchid table is full again. Geir |
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