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bactericide for crown gall

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Posted by andreark 9b (My Page) on
Tue, Nov 19, 13 at 11:10

Does anyone know a good bactericide to use for drenching the soil around the area where I just removed a rose bush infected with bacterial Crown Gall?

I can't find a website where I can purchase the ones that I saw on the web (Galltrol and Gallex). Is there something else I can use?

andrea

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RE: bactericide for crown gall

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This is a post by Karl three years ago on the subject. I have a Teasing Geogia that is developing galls. I will try his method this coming spring. See below

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I do surgery on the infected plant. I remove it from the soil and wash all the soil off the roots. I place it on a newspaper and carefully remove the gall. Using an Exacto knife I carefully cut away the area where the gall was attached, until I get to clean uninfected wood..I then put antibacteria ointment on the wound. The cheap stuff from Wal-Mart.
I mix a cup of bleach in 5 gallons of water, drench the soil where the rose was planted, then replant the bush treating it as a bare root.
Every rose I've treated this way has recovered and grown nicely.
Crown Gall is from a bacteria in the soil so it made sense to me to treat it as a bacteria infection.
Don't know if anyone else has done this but it works for me and I've never lost a bush to Crown Gall as a result.
Great care must be taken to avoid nicking the bush anywhere close to the ground. Crown gall can enter through a pruner nick, or an insect bite or even a scrape in the bark. I wrap up the gall removed from the plant and destroy it.

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RE: bactericide for crown gall

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Your soil is full of bacteria and worms which cause it to become rich and fertile. You couldn't have compost without bacteria. Do you really want to kill everything in your soil? Stop worrying about galls. I would do what Karl does except you don't need to dig up the rose and replant it. Galls are very slow. They wont come back for a long time if the do.

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RE: bactericide for crown gall

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  • Posted by hoovb z9 Southern CA (My Page) on
    Tue, Nov 19, 13 at 13:47

Galltrol-A or Gallex are generally what is recommended.

Here is a link that might be useful: Galltrol-A / Gallex

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RE: bactericide for crown gall

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Thanks all.

hoovb,

Those were the two products that I found when researching bactericides. Unfortunately, their websites don't show where to purchase or their telephone numbers are disconnected. If you have more info on them, please let me know. Thanks for your input.

Regan's has a small Francis Meilland for me. And just to be safe, I think I will plant it in one of my large pots (24 gallons) and place the pot where the original was planted. I will be able to leave it in the pot for a couple of years.

As my friend and local rosarian said, this gall is not one of the 'slow' types. It grew to tennis ball size in a matter of less than 2 months.

Thanks again y'all,

andrea

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RE: bactericide for crown gall

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Andrea, just in case you are interested in another option for dealing with Agrobacterium tumefaciens, I'm posting the link below, which is basically suggesting rotating a resistant species in the area where the galled plant was. According to the article at the link, "Growing a nonsusceptible crop, such as grass, for three years can essentially eliminate the bacteria from the soil".

Melissa

Here is a link that might be useful: Virginia Exten., Crown Gall of Woody Ornamentals

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RE: bactericide for crown gall

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Thanks Tessiess,

I've seen that option mentioned. Actually at that very site. That site suggested letting the soil 'rest' for a few years. I really like university sites. The problem is that it's a raised bed with only roses. It's probably the best option for the soil. But it wouldn't look great with 7 roses and a bunch of pansies. (a joke, of course)

The spot is the furthest back in my yard and is behind other roses The pot would therefore be 'hidden' from view.

Thanks so much for answering,

andrea

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