Shelf life of Dithane

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Primrose
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On hearing me complaining about being no longer able to purchase Dithane to spray against tomato blight a friend has given me an unopened packet of 6 sachets which he admits might be "a few years old". There is no expiry date on the packet so can I assume it t will still be effective?
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Tigger
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You've got nothing to lose. try it!
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Motherwoman
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Having heard a few times on this forum how products degrade I think I'd leave it well alone, but perhaps someone on here knows different?

MW
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Gerry
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I have the remains of a 1kg box dated 2010 and I have been using it each year since, with no ill effects. (So far). Oh! And it's been effective too.
Regards,
Gerry.
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