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Daconil and Early Blight

Posted by otomato-o 5 (My Page) on
Thu, Jul 29, 10 at 8:17

I have early blight on a good portion of my heirloom tomatoes, very prevalent this year in illinois due to the weather conditions. I started using daconil, a fungicide, every few weeks to help me slow the fungus and I do think it helps.

My question that I can't seem to find the answer to is how long after treating the plants, can you safely harvest and eat the fruit? 3 days? a week?


Follow-Up Postings:

RE: Daconil and Early Blight

  • Posted by jean001 z8aPortland, OR (My Page) on
    Thu, Jul 29, 10 at 21:33

It should be on the label as either "PHI" or the words "pre-harvest interval" which is the number of days or weeks you must wait.

RE: Daconil and Early Blight

Daconil has no pre-harvest interval for tomatoes; this information sheet from University of Wisconsin lists the pre-harvest interval for all products containing chlorothalonil as 0 days when applied to tomatoes. It's fairly inert and doesn't get into plant tissues at all; it just acts as a physical barrier against fungal penetration.

If it eases your mind at all, the toxicity of chlorothalonil is really, really low in mammals, lower than many organic treatments like sulfur; even if you eat a little by accident, it won't hurt you. So just wash the fruit before you eat them, and follow any other label directions.


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