For those of you who haven’t had to deal with Japanese beetles this year, consider yourself lucky. They are all over Minnesota right now, causing damage to all sorts of different crops and garden plants. While they don’t do damage to the actual grapes in the vineyard, they do extensive damage to the leaves. This damage will ultimately deteriorate the quality of your grapes, as it prevents the leaves from producing sugar through photosynthesis. It also decreases the respiration in your vine which will limit the decrease in acidity in your grapes. The University of Minnesota extension service wrote a great Q&A article on the Japanese Beetle, and how to manage it. These little bugs will be bad news to your grapes this year! Remember, quality wine is first made in the vineyard!
August 5, 2011 by