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#1
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Damned Leaf Spot
Sigh. It seems that I get a second year of tomato leaf spot.
At least I think I recognized it earlier this year than last. The plants still look vibrant. And I know not to get lax about respraying like I did last year. I had the thought to do a preemptive spraying of copper sulfate when I set them out. I should have followed through with that. Unfortunately we were out of town last week, and I was recovering from exhaustion for the beginning of the week. Otherwise, I might have figured it out sooner. On the up side, I ate the first tomato and first cucumber of the year yesterday. I had thinned the cucumber cages to about half the density of last year, and I'm thinking they may still be too crowded. I had to weave the vines onto the cages yesterday, since they'd sprawled about 4 feet instead of climbing. -- Drew Lawson "Please understand that we are considerably less interested in you than you are." -- Madeleine Page, on the deep truths of alt.folklore.urban |
#2
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Damned Leaf Spot
Drew Lawson wrote:
Sigh. It seems that I get a second year of tomato leaf spot. At least I think I recognized it earlier this year than last. The plants still look vibrant. And I know not to get lax about respraying like I did last year. I had the thought to do a preemptive spraying of copper sulfate when I set them out. I should have followed through with that. Unfortunately we were out of town last week, and I was recovering from exhaustion for the beginning of the week. Otherwise, I might have figured it out sooner. On the up side, I ate the first tomato and first cucumber of the year yesterday. I had thinned the cucumber cages to about half the density of last year, and I'm thinking they may still be too crowded. I had to weave the vines onto the cages yesterday, since they'd sprawled about 4 feet instead of climbing. That's what my tomato plants look like ! Copper sulphate , you say ? Mine are pretty bad , look like stems with a few leaves . Gotta get some of that stuff , I was told it was likely spotted leaf wilt , a viral problem . Will dusting with sulphur help ? -- Snag |
#3
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Damned Leaf Spot
In article
"Terry Coombs" writes: Drew Lawson wrote: Sigh. It seems that I get a second year of tomato leaf spot. That's what my tomato plants look like ! Copper sulphate , you say ? Mine are pretty bad , look like stems with a few leaves . Gotta get some of that stuff , I was told it was likely spotted leaf wilt , a viral problem . Will dusting with sulphur help ? I don't think sulphur will help with viruses, but I don't know. I'm mostly familiar with it as a fungicide. Tomato leaf spot is a fungal problem, with spores splashed from infected leaves to uninfected, so the problem mostly climbs up as the plant grows. The copper sulphate worked well on it last year, but my experience is that it suppresses the spread rather than killing off the problem. So this year, I will keep spraying for the rest of the season. What I have is a powder/dust, and I mix it in a 1500ml hand sprayer. I'm a tree-hugging sort, but don't mess with my tomatoes. -- Drew Lawson So risk all or don't risk anything You can lose all the same |
#4
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Damned Leaf Spot
Drew Lawson wrote:
In article "Terry Coombs" writes: Drew Lawson wrote: Sigh. It seems that I get a second year of tomato leaf spot. That's what my tomato plants look like ! Copper sulphate , you say ? Mine are pretty bad , look like stems with a few leaves . Gotta get some of that stuff , I was told it was likely spotted leaf wilt , a viral problem . Will dusting with sulphur help ? I don't think sulphur will help with viruses, but I don't know. I'm mostly familiar with it as a fungicide. Tomato leaf spot is a fungal problem, with spores splashed from infected leaves to uninfected, so the problem mostly climbs up as the plant grows. The copper sulphate worked well on it last year, but my experience is that it suppresses the spread rather than killing off the problem. So this year, I will keep spraying for the rest of the season. What I have is a powder/dust, and I mix it in a 1500ml hand sprayer. I'm a tree-hugging sort, but don't mess with my tomatoes. I have a bottle of Spinosad at my right elbow as I sit here ... it's supposed to control thrips , which are supposedly the vector for this tomato spotted wilt virus . They were beginning to improve but in the last day or three seem to have taken a turn for the worse . I was counting on these tomatoes for a winter's plus supply for sauce and paste . -- Snag |
#5
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Damned Leaf Spot
Derald wrote:
http://vegetablemdonline.ppath.corne...omLeafKey.html http://www.missouribotanicalgarden.o...20Problems.pdf http://www.ext.colostate.edu/pubs/Garden/02949.html http://aggie-horticulture.tamu.edu/v...solver/leaves/ http://pods.dasnr.okstate.edu/docush...PP-7625web.pdf http://erec.ifas.ufl.edu/tomato-scou...ease-key.shtml http://www.gardeningknowhow.com/edib...o-diseases.htm That first link is the one that led me to believe this is the spotted wilt virus , but I don't have the charactristic discoloration on the fruit . Now I'm even more confused . -- Snag |
#6
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Damned Leaf Spot
Terry Coombs wrote:
.... I'm even more confused . do you have fruit on the plants that is fairly good sized already? songbird |
#7
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Damned Leaf Spot
In article
"Terry Coombs" writes: Derald wrote: http://vegetablemdonline.ppath.corne...omLeafKey.html That first link is the one that led me to believe this is the spotted wilt virus , but I don't have the charactristic discoloration on the fruit . Now I'm even more confused . Just wanted to comment that their pictures for tomato leaf spot (Septoria) are very good, exactly what I'm dealing with. I don't know whether that translates to good quality on all their pages. It is frustrating that there are so many things that kill tomato leaves. In retrospect, I've been very lucky that I went so many years without having a problem. -- Drew Lawson | I'd like to find your inner child | and kick its little ass |
#8
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Damned Leaf Spot
songbird wrote:
Terry Coombs wrote: ... I'm even more confused . do you have fruit on the plants that is fairly good sized already? songbird Yes , and some has been picked , more is ready/almost ready . -- Snag |
#9
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Damned Leaf Spot
Drew Lawson wrote:
In article "Terry Coombs" writes: Derald wrote: http://vegetablemdonline.ppath.corne...omLeafKey.html That first link is the one that led me to believe this is the spotted wilt virus , but I don't have the charactristic discoloration on the fruit . Now I'm even more confused . Just wanted to comment that their pictures for tomato leaf spot (Septoria) are very good, exactly what I'm dealing with. I don't know whether that translates to good quality on all their pages. It is frustrating that there are so many things that kill tomato leaves. In retrospect, I've been very lucky that I went so many years without having a problem. I suspect part of my problem is the varieties I chose , all heirlooms . -- Snag |
#10
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Damned Leaf Spot
In article
"Terry Coombs" writes: Drew Lawson wrote: In article "Terry Coombs" writes: Derald wrote: http://vegetablemdonline.ppath.corne...omLeafKey.html That first link is the one that led me to believe this is the spotted wilt virus , but I don't have the charactristic discoloration on the fruit . Now I'm even more confused . Just wanted to comment that their pictures for tomato leaf spot (Septoria) are very good, exactly what I'm dealing with. I don't know whether that translates to good quality on all their pages. It is frustrating that there are so many things that kill tomato leaves. In retrospect, I've been very lucky that I went so many years without having a problem. I suspect part of my problem is the varieties I chose , all heirlooms . As are mine. Now that I have the fungus in my garden, it will probably be a problem for at least several years. I have to get much better about controlling weeds that can be extra hosts. I realized while spraying that I probably also need to space the cages about twice as far apart as I did this year (which is slightly farther than last year), to reduce how much gets spread between plants. -- |Drew Lawson | If you're not part of the solution | | | you're part of the precipitate. | |
#11
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Damned Leaf Spot
Derald wrote:
You may benefit from a closer look at the Missouri Botanical Garden's document. Photos are excellent and it lists "lookalikes" and points out (some of) their differences. I did look at it , came away with the same diagnosis . Sometimes a patch just sucks . I had my squashes/cukes/melons in that patch last year . Lost almost everything to squash stem root rot , a fungal infection aggravated by excess rain . Which we had , both last year and this . Sometimes ya gotta just suck it up and go on . -- Snag |
#12
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Damned Leaf Spot
Terry Coombs wrote:
songbird wrote: Terry Coombs wrote: ... I'm even more confused . do you have fruit on the plants that is fairly good sized already? Yes , and some has been picked , more is ready/almost ready . then you're at least going to get a harvest, those that are big enough can be set aside in the garage or someplace and they'll eventually ripen. not quite as good as vine ripened but usually acceptable for sauces or ... we've done that some years when the plants have dropped their leaves due to blights. i've never bothered to spray, but mulching to prevent leaf splash and removing leaves from the lower part of the plants didn't make any difference. the challenge was finding enough space to set them out (on old towels so they'd not rot) in the garage, but most come through just fine in time. a few might rot anyways. we'd go through them once in a while to find them and get them off the tables. Ma had the idea that we should set them in the sun, but that is not a good idea once the tomato is off the plant. she still does it by setting them on the window sill... ah well, can't change habits of some folks sometimes. songbird |
#13
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Damned Leaf Spot
Once upon a time on usenet Derald wrote:
http://vegetablemdonline.ppath.corne...omLeafKey.html http://www.missouribotanicalgarden.o...20Problems.pdf http://www.ext.colostate.edu/pubs/Garden/02949.html http://aggie-horticulture.tamu.edu/v...solver/leaves/ http://pods.dasnr.okstate.edu/docush...PP-7625web.pdf http://erec.ifas.ufl.edu/tomato-scou...ease-key.shtml http://www.gardeningknowhow.com/edib...o-diseases.htm Thanks for the links. -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
#14
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Damned Leaf Spot
Once upon a time on usenet Derald wrote:
"~misfit~" wrote: Thanks for the links Hope you find the information useful. Use with caution: Those sorts of guides can easily lead to confusion. Concentrating on the visuals only can be misleading. It is important also to be aware of contributing factors such as season, prevailing weather conditions, soil conditions, nutrient levels, etc. etc. Understood. Thanks again. -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
#15
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Damned Leaf Spot
On Thu, 30 Jul 2015 15:17:20 +1200, "~misfit~"
wrote: Once upon a time on usenet Derald wrote: "~misfit~" wrote: Thanks for the links Hope you find the information useful. Use with caution: Those sorts of guides can easily lead to confusion. Concentrating on the visuals only can be misleading. It is important also to be aware of contributing factors such as season, prevailing weather conditions, soil conditions, nutrient levels, etc. etc. Understood. Thanks again. I have found that another variable is tomato variety, too. Over and above the specific ones that are wilt-resistant, some are just overly sensitive to it. I have found that Pink Berkeley Tie-Dye are highly susceptible to fungal attack...also to scald and blossom end rot. Damn fine tomatoes if they make it through, though. I am growing a lot of different varieties this year, each in large tubs, each in exactly the same growing medium. The different tubs are being treated as similarly as one can do under home gardening conditions, so I really believe some of what I am seeing is variety based. |
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