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#1
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Rose Gall
This question may have been covered before but here goes.The ARS site says:
Crown gall (Agrobacterim tumefaciens) Overgrowths or galls form on stem and roots. Infection occurs mainly through wounds. In soil. Bacteria spread in water. Gall development is favored by rapidly growing host. Avoid injuring base of plant and roots. Paint galls with Gallex to eradicate them When one buys bare root plants and there is some slight damage to the root, the recommended practice is to remove the damage. Isn't this a wound? Why doesn't this action allow crown (root) gall to happen in almost every rose planted??? I understand that the bacteria that causes gall is ubiquitous in the soil. Thanks in advance for any insight with this question. |
#2
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Rose Gall
Hello Barron,
I guess it would be simpler to explain that to be stabbed with a rusty knife is not akin to being operated on with a scalpel. Some times what is commonly called a "wound" is caused by scraping the outer tissue of the plant with a sharp tool, like the edge of a spade, or a shovel. This is not a "clean" cut but it tends to be a form of scraping or tearing the plant's tissue. To add insult to injury, we tend to cover the "wound" with soil that may be infected with the bacteria that develops into Agrobacterim tumefaciens. As the wound tries to heal itself, it encloses within this bacteria and it becomes a little encapsulated area where the gall will eventually develop. When you cut any part of your rose, one has to assume you are using both a very sharp instrument and a disinfected one. Cutting the entire surface gives very little space for the bacteria to find a home there. It is usually advised to remove the gall with a sterilized knife and then wash the cut with undiluted Clorox to avoid further contamination. One can actually irrigate the area where the crown gall is suspected to be with Clorox without any adverse effect to the roses. My suggestion would be to remove all the soil around the area and to dispose of it. Lay the soil afallow for as long as you can, but if this is not possible, then make sure that new soil is brought in for instance, and wash the entire root system of the plant with Clorox to prevent any infection as well if you are planting a new rose there. When we moved here a gorgeous red rose (still unnamed) caught my eye and under years of neglect there it was the telltale of the growth. We have a Japanese handsaw that was promptly put to use, and I cut the entire portion of the crown that was affected. We followed the instructions above and this Spring she looks magnificent and full leafed right now believe it or not. Healthy as a horse but we moved her to another location and replaced the soil and will wait until next year to plant any roses where she was. I hope this helps to see the difference. It is the "wound" type versus the "clean cut" that creates the problem and an inviting environment for the gall to take hold. Allegra "Barron" wrote in message ... This question may have been covered before but here goes.The ARS site says: Crown gall (Agrobacterim tumefaciens) Overgrowths or galls form on stem and roots. Infection occurs mainly through wounds. In soil. Bacteria spread in water. Gall development is favored by rapidly growing host. Avoid injuring base of plant and roots. Paint galls with Gallex to eradicate them When one buys bare root plants and there is some slight damage to the root, the recommended practice is to remove the damage. Isn't this a wound? Why doesn't this action allow crown (root) gall to happen in almost every rose planted??? I understand that the bacteria that causes gall is ubiquitous in the soil. Thanks in advance for any insight with this question. |
#3
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Rose Gall
Hello Barron,
I guess it would be simpler to explain that to be stabbed with a rusty knife is not akin to being operated on with a scalpel. Some times what is commonly called a "wound" is caused by scraping the outer tissue of the plant with a sharp tool, like the edge of a spade, or a shovel. This is not a "clean" cut but it tends to be a form of scraping or tearing the plant's tissue. To add insult to injury, we tend to cover the "wound" with soil that may be infected with the bacteria that develops into Agrobacterim tumefaciens. As the wound tries to heal itself, it encloses within this bacteria and it becomes a little encapsulated area where the gall will eventually develop. When you cut any part of your rose, one has to assume you are using both a very sharp instrument and a disinfected one. Cutting the entire surface gives very little space for the bacteria to find a home there. It is usually advised to remove the gall with a sterilized knife and then wash the cut with undiluted Clorox to avoid further contamination. One can actually irrigate the area where the crown gall is suspected to be with Clorox without any adverse effect to the roses. My suggestion would be to remove all the soil around the area and to dispose of it. Lay the soil afallow for as long as you can, but if this is not possible, then make sure that new soil is brought in for instance, and wash the entire root system of the plant with Clorox to prevent any infection as well if you are planting a new rose there. When we moved here a gorgeous red rose (still unnamed) caught my eye and under years of neglect there it was the telltale of the growth. We have a Japanese handsaw that was promptly put to use, and I cut the entire portion of the crown that was affected. We followed the instructions above and this Spring she looks magnificent and full leafed right now believe it or not. Healthy as a horse but we moved her to another location and replaced the soil and will wait until next year to plant any roses where she was. I hope this helps to see the difference. It is the "wound" type versus the "clean cut" that creates the problem and an inviting environment for the gall to take hold. Allegra "Barron" wrote in message ... This question may have been covered before but here goes.The ARS site says: Crown gall (Agrobacterim tumefaciens) Overgrowths or galls form on stem and roots. Infection occurs mainly through wounds. In soil. Bacteria spread in water. Gall development is favored by rapidly growing host. Avoid injuring base of plant and roots. Paint galls with Gallex to eradicate them When one buys bare root plants and there is some slight damage to the root, the recommended practice is to remove the damage. Isn't this a wound? Why doesn't this action allow crown (root) gall to happen in almost every rose planted??? I understand that the bacteria that causes gall is ubiquitous in the soil. Thanks in advance for any insight with this question. |
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