Influence of cluster rot clots on the crop quality of wine grapes from Michigan vineyards

Michigan vineyards are subject to a wide range of pests. Many of these can be effectively

controlled each year through cultural and chemical methods, however our Michigan climate is

highly conducive to cluster rots that can ruin an otherwise excellent crop. Mitigating losses in

yield due to bunch rot diseases, such as gray mold and sour rot, is always a problem in a cool

and humid environment. Cluster rots are a significant challenge for growers to manage because

they are pest complexes where bacteria, yeasts, filamentous fungi, and insects are involved.

These infections can compromise quality-related metabolites, such as organic acids, phenolics,

and volatiles which impacts the quality and flavor of wine. Our research aims to minimize the

risk of these diseases by improving understanding of the insect-disease interactions and

developing improved management strategies.