May 4, 2016

Project receives $2.3 million grant to combat downy mildew

USDA has awarded Michigan State University (MSU) researchers and collaborators at six other universities across the country a four-year, $2.3 million grant to develop management plans for downy mildew.

After nearly 120 years as a relatively rare, easily managed crop disease, downy mildew surged in 2004 — devastating cucurbit crops throughout southeastern United States. The disease spread into Michigan and the Midwest the following year, and has been a serious problem ever since. More than 2.6 million acres, representing approximately $7.5 billion in high-value crops, are affected each year by downy mildew.

MSU AgBioResearch plant pathologist Mary Hausbeck is the lead on the grant project. She has been helping Michigan vegetable growers battle downy mildew for the past 10 years. The threat has risen in recent years as the pathogen has developed resistance to many formerly effective fungicides, she said.

Hausbeck and her colleagues have formed a multi-state research group uniting plant pathologists, plant breeders, social scientists and economists in efforts to develop advanced tactics for growers to confront downy mildew. They will work to enhance and refine early detection methods that allow growers to identify the pathogen’s presence in the air even before it infects fields and becomes a problem. Current early detection practices are labor-intensive and do not provide growers with real-time updates.

Recent advances in genomics and molecular biology will allow the group to design and implement improved diagnostic and forecasting tools to identify and track the pathogen. Plant breeders will also work on developing and testing new downy mildew-resistant varieties of cucumbers, basil and spinach, some of the most threatened crops.

A nationwide outreach program will also work to deliver the group’s findings to growers through regularly updated web-based tools and talks with growers and other industry stakeholders. A coordinated summer internship program will train a diverse group of undergraduate students.

Slowing the advance of downy mildew in Michigan is especially critical to the state’s food industry.

“East of the Mississippi, we tend to have humid conditions and plenty of rainfall,” Hausbeck said. “That’s a good growing climate, but it’s also an inviting climate for diseases. If we can’t control them, that means we’ll have to start sourcing our vegetables from farther west. I think consumers would rather have their cucurbits and basil locally grown.”

In addition to MSU, the University of Florida, Oregon State University, Rutgers University, Cornell University, California State University and North Carolina State University, as well as the USDA Agricultural Research Service, are participating in the grant project.