In the line 'season of mist and mellow fruitfulness', the main appeal is to the sense of

In the line "season of mist and mellow fruitfulness," the main appeal is to the sense of sight. The words "mist" and "mellow fruitfulness" create vivid mental images of autumnal scenery, which appeals to our visual sense. The image of mist suggests a hazy, dreamlike atmosphere, and the phrase "mellow fruitfulness" evokes the idea of ripe, colorful fruit hanging from trees, both of which are visual descriptions. Therefore, the line appeals to our ability to imagine or visualize a beautiful, serene autumn season.