Growth on my hawthorn.

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Growth on my hawthorn.

Post  Smithy on Mon Jul 05, 2010 8:15 am

I'm not sure if this is a problem or not. Does any one know what this is on my hawthorn. Is it a problem.



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Re: Growth on my hawthorn.

Post  JimLewis on Mon Jul 05, 2010 12:40 pm

It's a rust, related to cedar-apple rust. You can try spraying with a fungicide now (I use lime sulfur) but amputation at this stage is generally the only "cure." You can help prevent it in the future with preventative spraying with a fungicide in later winter or early spring. 2 or 3 applications a week or so apart.

Keep hawthorn away from Juniperus species.

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Re: Growth on my hawthorn.

Post  Hans van Meer. on Mon Jul 05, 2010 1:12 pm

You are just in the beginning of building up your branches on this young tree, so there is no reason not to cut it off immediately, as far away as possible from the infestation and than spray the tree with diluted lime sulfur! When you do so, cover up the ground surface with plastic so that the stuff those not penetrate the surface. Put the infested plant as far away as possible from your other trees until you are sure it is rust free! Make sure to clean your cutter you used with alcohol or with a small flame, to prevent this stuff from spreading! Look closely at all your other trees for signs of further infestation! Preventive spraying in early and late winter will help these infestations to happen!
Good luck,
Hans van Meer.

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Re: Growth on my hawthorn.

Post  Smithy on Mon Jul 05, 2010 9:19 pm

Thankyou both for your posts. I will do as you suggest and will keep a look out on my other trees.

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Re: Growth on my hawthorn.

Post  Smithy on Tue Jul 06, 2010 7:46 am

One question about using lime slupur. Two actually. What dilution do you use, and do you only use it when the tree is not in leaf.

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Re: Growth on my hawthorn.

Post  Kev Bailey on Tue Jul 06, 2010 10:09 am

Mix Lime Sulphur with water at a rate of between 1:25 to 1:50 One teaspoon holds 5ml of lime sulphur so you can add between 2 to 4 teaspoons of lime sulphur to 1/2 litre of water. Keep it off the leaves as it can scorch them, but if you apply it carefully, with a disposable soft bristled brush, there shouldn't be a problem. (Disposable as the bristles will fall apart after a few uses.)


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Re: Growth on my hawthorn.

Post  Smithy on Tue Jul 06, 2010 9:46 pm

Thanks Kev.

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Re: Growth on my hawthorn.

Post  JimLewis on Tue Jul 06, 2010 9:53 pm

My bottle says 1:40. I use a spray bottle. I apply when the tree needs it, leaves or no -- and I don't usually cover the soil at this dilution.

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Jim Lewis - lewisjk@windstream.net - Western NC - People, when Columbus discovered this country, it was plumb full of nuts and berries. And I'm right here to tell you the berries are just about all gone. Uncle Dave Macon, old-time country musician

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Re: Growth on my hawthorn.

Post  Guest on Tue Jul 06, 2010 11:10 pm

I've been using a mix of 1:30 for years now and this mix cures and prevents many fungal diseases.

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Re: Growth on my hawthorn.

Post  Smithy on Wed Jul 07, 2010 7:26 am

will baddeley wrote:I've been using a mix of 1:30 for years now and this mix cures and prevents many fungal diseases.

Do you spray this on the leaves like Jim does.

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Re: Growth on my hawthorn.

Post  Hans van Meer. on Wed Jul 07, 2010 10:42 am

Smithy wrote:
will baddeley wrote:I've been using a mix of 1:30 for years now and this mix cures and prevents many fungal diseases.

Do you spray this on the leaves like Jim does.

Yes, no problem! To stop further contamination of the tree you are spraying and for the trees surrounding, you need to spray every part of the tree! But to prevent the freshly sprayed solution from dripping on to your soil surface and penitrates your soil, cover it up with some plastic. For the same reason, during the next couple of days dont spray the foliage when you water!
Cheers,
Hans van Meer.

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Re: Growth on my hawthorn.

Post  Smithy on Wed Jul 07, 2010 7:54 pm

Hans van Meer. wrote:
Smithy wrote:
will baddeley wrote:I've been using a mix of 1:30 for years now and this mix cures and prevents many fungal diseases.

Do you spray this on the leaves like Jim does.

Yes, no problem! To stop further contamination of the tree you are spraying and for the trees surrounding, you need to spray every part of the tree! But to prevent the freshly sprayed solution from dripping on to your soil surface and penitrates your soil, cover it up with some plastic. For the same reason, during the next couple of days dont spray the foliage when you water!
Cheers,
Hans van Meer.

Thanks Hans
I am getting the full picture now . I just like to know all the details befoe i start spraying things. I have a few fungus problems and have not got on top of it. I will be on it this weekend.

does the lime sulphur have a shelf life as i have a couple of opened bottles that have been in the shed for at least a year.
Thanks Smithy

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Re: Growth on my hawthorn.

Post  Guest on Wed Jul 07, 2010 8:09 pm

I've had the same bottle for the last three years and it still works. I drape an old thick towel over the soil and leave until the tree has dried. I tend to spray as buds start to open in the Spring, as a preventative for most fungal diseases but see no reason why it cannot be applied now. Make sure you get in underneath aswell

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Re: Growth on my hawthorn.

Post  Smithy on Wed Jul 07, 2010 8:18 pm

will baddeley wrote:I've had the same bottle for the last three years and it still works. I drape an old thick towel over the soil and leave until the tree has dried. I tend to spray as buds start to open in the Spring, as a preventative for most fungal diseases but see no reason why it cannot be applied now. Make sure you get in underneath aswell

Thanks Will, Thats a good idea with the towel . I will start spraying now but i will be preventative spraying next year.


Last edited by Smithy on Wed Jul 07, 2010 11:03 pm; edited 1 time in total

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Re: Growth on my hawthorn.

Post  JimLewis on Wed Jul 07, 2010 9:50 pm

Good luck!

_________________
Jim Lewis - lewisjk@windstream.net - Western NC - People, when Columbus discovered this country, it was plumb full of nuts and berries. And I'm right here to tell you the berries are just about all gone. Uncle Dave Macon, old-time country musician

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Re: Growth on my hawthorn.

Post  Smithy on Wed Jul 07, 2010 11:05 pm

Thanks Jim.

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Re: Growth on my hawthorn.

Post  Nina on Sat Jul 17, 2010 6:42 pm

Let me clarify two things here: first, if the weather is hot, do not apply lime sulfur. Second, let's remember the life cycle of the cedar-apple rusts (this is cedar-hawthorn rust, of course). One type of spore is produced by junipers and infects rose hosts; the spores produced on the rose host infects junipers. By July, and if it's as hot and dry where you are as it is here, junipers are no longer infective and there's no further worry to the hawthorns. What you need to do is look for the infected junipers and trim off the galls for next year [with cedar apple rust, the galls only last one year, so don't even worry; hawthorn rust galls last a few years, so it's worth getting rid of them; quince rust galls are perennial, so it's totally worth finding and destroying them). So that growth on your hawthorn: cut it off. And if you have juniper bonsai, *they* are the ones in peril from the spores produced on that growth. Watch them carefully next spring and remove any galls. The cedar-apple rust galls are produced on leaf scales, so they can be removed without aesthetic damage to a bonsai; hawthorn rust attacks young twigs, so the risk to the beauty of an infected juniper is much higher and needs to be caught earlier.

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Re: Growth on my hawthorn.

Post  Smithy on Sat Jul 17, 2010 6:57 pm

Thanks Nina that is very helpful. I will digest this so i understand it fully. Do you have any pics of the galls on junipers.

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Re: Growth on my hawthorn.

Post  Nina on Sat Jul 17, 2010 7:03 pm

When immature, a hawthorn rust gall just looks like a bumpy growth; when mature and after a rainstorn, it exudes orange-yellow tentacles that I think you'll know when you see. The cedar-apple gall is showier:

http://plantclinic.cornell.edu/FactSheets/cedar-applerust/cedar-applerust.htm

but this fact sheet has a good picture of the stage on hawthorn.

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Re: Growth on my hawthorn.

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