Good Combo for Disease Management in eastern PA

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Hi guys,

I'm in the burbs of Philly with some chambourcin and red/white/blue table grape vines.

Wondering if I'm covering disease management with a solution of Immunox + CAPTAN sprayed on every 10 to 14 days (depending on rain)?

Last year I took a beating with anthracnose and black rot and looking not to repeat that.

Thanks,
Mike
 

Cynewulf

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I think it will depend on your disease pressure, your cultivar’s susceptibility, and how many times you have to spray. There are a number of fungicide charts but I think this one is pretty good summary: https://plantpathology.ca.uky.edu/files/ppfs-fr-s-18.pdf. Immunox is myclobutanil which is highly effective against black rot, powdery mildew, and anthracnose, while Captan gives you coverage against downy mildew. However, you also want to pay attention to the pre harvest interval (PHI) and the maximum number of applications per season. Immunox has, I think, a PHI of 14 days but 5 applications per season. I’m in Northern Virginia with heavy disease pressure and a mix of vinifera and hybrids so spray with mancozeb and sulfur weekly early in the season for black rot, downy mildew, powdery mildew, and anthracnose. But mancozeb has a PHI of 66 days and a maximum 6 applications per season so I switch to Immunox and Captan after 6 weeks or so. I also like this poster that VT put together: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/ENTO/ento-339/ENTO-339.pdf.
 
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I think it will depend on your disease pressure, your cultivar’s susceptibility, and how many times you have to spray. There are a number of fungicide charts but I think this one is pretty good summary: https://plantpathology.ca.uky.edu/files/ppfs-fr-s-18.pdf. Immunox is myclobutanil which is highly effective against black rot, powdery mildew, and anthracnose, while Captan gives you coverage against downy mildew. However, you also want to pay attention to the pre harvest interval (PHI) and the maximum number of applications per season. Immunox has, I think, a PHI of 14 days but 5 applications per season. I’m in Northern Virginia with heavy disease pressure and a mix of vinifera and hybrids so spray with mancozeb and sulfur weekly early in the season for black rot, downy mildew, powdery mildew, and anthracnose. But mancozeb has a PHI of 66 days and a maximum 6 applications per season so I switch to Immunox and Captan after 6 weeks or so. I also like this poster that VT put together: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/ENTO/ento-339/ENTO-339.pdf.
Great poster - thanks. Geez, there is a lot to do but better to know about it and follow this!
 

David Violante

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I think it will depend on your disease pressure, your cultivar’s susceptibility, and how many times you have to spray. There are a number of fungicide charts but I think this one is pretty good summary: https://plantpathology.ca.uky.edu/files/ppfs-fr-s-18.pdf. Immunox is myclobutanil which is highly effective against black rot, powdery mildew, and anthracnose, while Captan gives you coverage against downy mildew. However, you also want to pay attention to the pre harvest interval (PHI) and the maximum number of applications per season. Immunox has, I think, a PHI of 14 days but 5 applications per season. I’m in Northern Virginia with heavy disease pressure and a mix of vinifera and hybrids so spray with mancozeb and sulfur weekly early in the season for black rot, downy mildew, powdery mildew, and anthracnose. But mancozeb has a PHI of 66 days and a maximum 6 applications per season so I switch to Immunox and Captan after 6 weeks or so. I also like this poster that VT put together: https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/ENTO/ento-339/ENTO-339.pdf.
Those are really good charts and posters. I’ve been using mancozeb and stylet oil following some local vineyard owners here in the Hudson Valley of NY. According to the chart though, those don’t do much for botrytis...
 
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