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David Gadoury

David GadouryThe second winner to receive an IPM award is David M. Gadoury, senior research associate in the Department of Plant Pathology at Cornell University in Geneva, NY. Gadoury works on the biology and ecology of plant pathogens, and how this information can be used to better manage diseases of grapes and apples. He emphasizes practicality, simplicity, economy, and biologically based solutions.

Focusing on powdery grape mildew, Gadoury, together with the late R. C. Pearson, determined how the fungus survived winter to cause infection in the spring. They then revised the grape disease management program to target the early part of the growing season, when the disease is inconspicuous, but easier to control. This new approach reduced the annual number of fungicide applications by as much as 50 percent in some cases, and simultaneously improved disease control. As a direct result of these changes, New York grape growers save nearly $1 million a year in lower fungicide costs, and produce higher quality of fruit.

Gadoury's research is expanding our knowledge of how other major grape diseases, such as downy mildew and black rot, develop. New information about diseases developing in sequence as they weaken a plant is helping growers to select fungicides that target each disease at the proper time. Gadoury is also involved in controlling powdery mildew with beneficial mites.

In the field of apples, Gadoury worked on managing apple scab for some 20 years, developing the "Potential Ascospore Dose" principle and a simple heat-maturity model that likewise predicts the availability of inoculum. His work on both apples and grapes has been incorporated into disease management programs in New York, the northeast region, and other parts of the world.

Gadoury earned both an M.S. and a Ph.D. in "Botany and Plant Pathology" at the University of New Hampshire.