Carolyn, you posted that Daconil was banned in some countries because of the Potato Spindle Viroid ...
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It was banned b'c of the Potato Spindle Viroid which infects both potatoes AND tomatoes and has now been seen in several places here in the US although I didn't take the time to Google that last comment to confirm that but anyone can do that as well.
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Speaking for myself,I wouldn't be so quick to condemn Daconil everywhere, but only for those countries/areas where the huge concern is that Potato Spindle Viroid. And I'm also sure that for many of you you've never heard of that disease until I posted about it.
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What Marsha was asking, and what we need explained is the mechanism by which Daconil makes it more likely for PSV to infect the potato plants. What action(s) of Daconil make it likely to cause the viroid to successfully thrive on potatoes? Why would a chemical coating to prevent attachments of fungal spores make it more attractive to viruses?