Dear Wisconsin grape growers: Graduate student, Courtney Meeks, is collecting powdery mildew and downy mildew samples for free fungicide resistance testing. If you are observing powdery mildew and/or […]

As we near harvest season, many Wisconsin vineyards are experiencing the effects of a rainy season on fruit clusters. Several commercial growers have reported dealing […]

The following diseases/disorders were identified at the PDDC from July 20, 2024 through July 26, 2024. PLANT/SAMPLE TYPE DISEASE/DISORDER PATHOGEN COUNTY FRUIT CROPS     […]

Just like that, it’s almost August! Veraison has set in for Southern Wisconsin vineyards, so the anticipation for harvest is upon us. We cover that […]

A cool front has made its way into Wisconsin. I think we are all sighing with relief and soaking up the cooler temperatures for however […]

In 2022, the PDDC continues to provide diagnoses through examination of digital photographs, as well as physical samples.  Click here for the PDDC’s current submission […]

In 2021, the PDDC continues with limited hours and limited sample processing capacity due to COVID-19.  Click here for the PDDC’s current submission policy.  The […]

Symptoms of grape diseases have shown up in the vineyards at the West Madison Agricultural Research Station (WMARS). Due to the recent drought conditions, disease […]

We saw reports of bud burst and 1- to 3-inch shoots this past week in Wisconsin. Critical fungicide application timing is now for several grape […]

Description Fungicide resistance to powdery and downy mildews is a growing concern for Midwest grape producers. Developing spray programs that focus not only on disease […]