Yes, it's blueberry time, at least according to this Taste poster cover, created by Star Tribune graphic artist Bruce Bjerva and published on July 18, 1984.
Here's a story that ran in the almost-all-blueberry issue of Taste published on July 18, 1984:
"The Taste office was knee-deep in blueberry recipes when LaVonne Misner, who is both a source and a friend, called to ask about a recipe for a blueberry pie made with blueberry jam. Misner, Hennepin County extension agent, home economics-family living, had been asked to track down the recipe by C. Peter Magrath, president of the University of Minnesota.
"Macgrath said the pie was one of the best he had ever had. He recalled that it appeared in the newspaper about a year ago and thought it had come from a university source.
"Voila! The April 4, 1983 issue of Picture magazine [the newspaper's Sunday magazine, now defunct] carried an article by staff writer Steve Brandt on the cold-resistant blueberries being developed by University of Minnesota plant breeders. The piece concluded with the easy yet elegant recipe below.
"Now we're wondering whether Magrath, who finds cooking relaxing, might include the pie in the cookbook he plans to write someday. He has already titled the volume: "Beyond Barbecue."
ULTIMATE BLUEBERRY PIE
Serves 9.