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#1
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A surprise!
Just now I pulled up a 4" petty spurge (a frequent and several-times-daily
activity although I usually get them when they're smaller). I noticed that on the underside of all the leaves were orange/brown slightly raised and crowded together spots. Any idea? Is it transferable to other plants? I grow vegetables although the only plants growing close to this were Easter Ledger - bistort. We don't eat their leaves at this time of year. Not very good pic at: http://tinypic.com/view.php?pic=2ij4ze1&s=3 TIA Mary |
#2
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A surprise!
In article , "Mary Fisher" writes: | Just now I pulled up a 4" petty spurge (a frequent and several-times-daily | activity although I usually get them when they're smaller). | | I noticed that on the underside of all the leaves were orange/brown slightly | raised and crowded together spots. | | Any idea? Rust. | Is it transferable to other plants? I grow vegetables although the only | plants growing close to this were Easter Ledger - bistort. We don't eat | their leaves at this time of year. Yes - to pretty well everything. But don't bother about it. There is NO point is worrying about rust transmission, as the rust fungi are ubiquitous, and there WILL be enough spores to infect your plants no matter what you do. And the spores travel miles. It causes trouble only under certain weather conditions, and there is effectively damn-all you can do about it. If you have one of the fungicides that our Lords and Masters forbid to the public but encourage commercial planters to use in excess (like Benlate), you can protect a few plants. Otherwise, you can decorate those plants with Bordeaux mixture, which will make a pretty contrast with the rust spores. Or you can call in your local weather witch and/or petition your favoured deity. Regards, Nick Maclaren. |
#3
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A surprise!
Mary Fisher writes
Just now I pulled up a 4" petty spurge (a frequent and several-times-daily activity although I usually get them when they're smaller). I noticed that on the underside of all the leaves were orange/brown slightly raised and crowded together spots. Any idea? Rust. Is it transferable to other plants? Dunno - I'm pretty sure there's more than one type of rust. I don't know how species-specific any of them are. -- Kay |
#4
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A surprise!
"K" wrote in message ... Mary Fisher writes Just now I pulled up a 4" petty spurge (a frequent and several-times-daily activity although I usually get them when they're smaller). I noticed that on the underside of all the leaves were orange/brown slightly raised and crowded together spots. Any idea? Rust. Is it transferable to other plants? Dunno - I'm pretty sure there's more than one type of rust. I don't know how species-specific any of them are. Thanks, Kay. I wonder why it was only on tht plant though, there are/have been lots of others of its ilk. Mary just musing ... |
#5
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A surprise!
In message , K
writes Mary Fisher writes Just now I pulled up a 4" petty spurge (a frequent and several-times-daily activity although I usually get them when they're smaller). I noticed that on the underside of all the leaves were orange/brown slightly raised and crowded together spots. Any idea? Rust. Is it transferable to other plants? Dunno - I'm pretty sure there's more than one type of rust. I don't know how species-specific any of them are. Some rusts have wide host ranges; others have narrow host ranges. Hollyhook rust, for example, attacks a variety of mallows with various degrees of severity. Hollyhocks, common mallow and it's near relatives, and musk mallows are the worse sufferers. Shrubby Lavateras aren't much affected. Some rusts have alternate hosts - if I recall correctly one rust attacks wheat and barberry. I'd be surprised if a rust of Euphorbia infected other genera. -- Stewart Robert Hinsley |
#6
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A surprise!
In article , Stewart Robert Hinsley writes: | | Some rusts have alternate hosts - if I recall correctly one rust attacks | wheat and barberry. It does. Looking at Collins indicates that most have alternate hosts, and there aren't many rusts that affect a wide range of plants. I was wrong there. | I'd be surprised if a rust of Euphorbia infected other genera. Try pea rust. They are the alternate host. And, given that 'pea' includes a fairly wide range of legumes, .... Regards, Nick Maclaren. |
#7
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A surprise!
Stewart Robert Hinsley wrote:
Some rusts have wide host ranges; others have narrow host ranges. Hollyhook rust, for example, attacks a variety of mallows with various degrees of severity. Hollyhocks, common mallow and it's near relatives, and musk mallows are the worse sufferers. Shrubby Lavateras aren't much affected. Some rusts have alternate hosts - if I recall correctly one rust attacks wheat and barberry. I'd be surprised if a rust of Euphorbia infected other genera. Talking of rust, I seem to be having a major problem with it this year, so far affecting peas (mange tout) garlic, hollyhocks and rhubarb. Is it transferable amongst these crops/plants, and what causes it, and is there anything I can do to prevent/treat it? |
#8
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A surprise!
In article , Sandy writes: | | Talking of rust, I seem to be having a major problem with it this year, | so far affecting peas (mange tout) garlic, hollyhocks and rhubarb. | | Is it transferable amongst these crops/plants, and what causes it, and | is there anything I can do to prevent/treat it? I believe not between those. You can't do much, no. Regards, Nick Maclaren. |
#10
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A surprise!
In message , Sandy
writes Stewart Robert Hinsley wrote: Some rusts have wide host ranges; others have narrow host ranges. Hollyhook rust, for example, attacks a variety of mallows with various degrees of severity. Hollyhocks, common mallow and it's near relatives, and musk mallows are the worse sufferers. Shrubby Lavateras aren't much affected. Some rusts have alternate hosts - if I recall correctly one rust attacks wheat and barberry. I'd be surprised if a rust of Euphorbia infected other genera. Talking of rust, I seem to be having a major problem with it this year, so far affecting peas (mange tout) garlic, hollyhocks and rhubarb. Is it transferable amongst these crops/plants, and what causes it, and is there anything I can do to prevent/treat it? I'd expect that you have four different rusts there. Pea rust = Uromyces fabae Garlic rust = Puccinia allii syn Puccinia porri Hollyhock rust = Puccinia malvacearum Rhubarb rust = Puccinia rhei-undulate -- Stewart Robert Hinsley |
#11
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A surprise!
In message , Nick Maclaren
writes In article , Stewart Robert Hinsley writes: | | Some rusts have alternate hosts - if I recall correctly one rust attacks | wheat and barberry. It does. Looking at Collins indicates that most have alternate hosts, and there aren't many rusts that affect a wide range of plants. I was wrong there. | I'd be surprised if a rust of Euphorbia infected other genera. Try pea rust. They are the alternate host. And, given that 'pea' includes a fairly wide range of legumes, .... Yes. I suppose I should have caveated the possibility of an alternative host. Regards, Nick Maclaren. -- Stewart Robert Hinsley |
#12
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A surprise!
Stewart Robert Hinsley wrote:
In message , Sandy writes Stewart Robert Hinsley wrote: Some rusts have wide host ranges; others have narrow host ranges. Hollyhook rust, for example, attacks a variety of mallows with various degrees of severity. Hollyhocks, common mallow and it's near relatives, and musk mallows are the worse sufferers. Shrubby Lavateras aren't much affected. Some rusts have alternate hosts - if I recall correctly one rust attacks wheat and barberry. I'd be surprised if a rust of Euphorbia infected other genera. Talking of rust, I seem to be having a major problem with it this year, so far affecting peas (mange tout) garlic, hollyhocks and rhubarb. Is it transferable amongst these crops/plants, and what causes it, and is there anything I can do to prevent/treat it? I'd expect that you have four different rusts there. Pea rust = Uromyces fabae Garlic rust = Puccinia allii syn Puccinia porri Hollyhock rust = Puccinia malvacearum Rhubarb rust = Puccinia rhei-undulate Thanks! Guess I've just been unlucky then! The garlic was ready for harvesting anyway, and I'm still taking rhubarb, so not adversely affected those, but I've had to pull up the mange tout as it had spread to the pods and was worried about eating them, so disappointed about that. Would you advise I burn it rather than compost? I'd hate to spread fungus spores to other crops if indeed it transfers this way. |
#13
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A surprise!
In article , Sandy writes: | | Would you advise I burn it rather than compost? I'd hate to spread | fungus spores to other crops if indeed it transfers this way. I wouldn't. Composting will destroy the spores, as far as I know, and they are ubiquitous, anyway. I had my broad beans wiped out by rust one year, composted the lot, and it didn't recur. To a first approximation, rust is caused by miasma. Like coral spot, incidentally. Regards, Nick Maclaren. |
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