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| Hello,
Was just wondering if anyone out there is using the older fungicide, Captan, to fight blackspot. If so, please comment on your experience with its effectiveness. Thanks. |
Follow-Up Postings:
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| I didn't know it was still available. I know it's not available here in CA. |
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| It is still available in N.Y. under the Bonide and Hy-Yield labels. Perhaps it was banned from Calif., as I know they have very different chemical laws from other states. |
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- Posted by kstrong 10 So Cal (kathystrong@gmail.com) on Wed, Jun 15, 11 at 11:49
| "EPA has classified captan as a Group B2, probable human carcinogen" Use something else. |
Here is a link that might be useful: EPA air toxics analysis document on Captan
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| I don't know about comparative effectiveness, but I've heard it tends to burn rose foliage, and I think it is more hazardous than some modern fungicides such as triforine and propiconazole. It is a surface protectant and would need more frequent application than propiconazole or tebuconazole |
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| Back in the Dark Ages, I used Captan to prevent damp-off of my rose seedlings. After they banned it, I used nothing and have had no issues. Kim |
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| The old timers in our rose club say that the modern fungicides work way better than what they had in the Dark Ages. |
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- Posted by blazeaglory 10 SZ22 OC Ca (My Page) on Tue, Apr 24, 12 at 11:56
| You would literally have to eat over 5mg of captan EVERYDAY for a year to get the same results as the mice in that test. California is a joke. |
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- Posted by flaurabunda 6a, Central IL (My Page) on Tue, Apr 24, 12 at 13:41
| Well, since the manufacturer doesn't put chocloate cake flavoring in Captan there's no danger of me eating more than 5mg of it. I use the Bayer stuff. Cheap, efficient, effective. |
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- Posted by henry_kuska z5 OH (kuska@neo.rr.com) on Tue, Apr 24, 12 at 16:39
| One can do experiments with animals to see which chemicals can be "potentially" dangerous. Normally, one then tests groups of workers that are known to be exposed to that particular chemical. This has been done for agricultural workers and captan regarding prostrate cancer. The specific captan data is not in the abstract, but it is in the full paper (which I cannot link to here due to copyright). I can give the data: The odds ration is 1.74 with a 95% confidence inteveral of 1.01 and 3.13 based upon 41 high exposure individuals and 26 control individuals. (The definition of "high" exposure given in the article is vague.) Here is one simple definition of the term "odds ratio": |
Here is a link that might be useful: abstract of captan - prostrate cancer study
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