Take a look at the sentence again:
During the summer when a variety of fruit is in
season, Melville always avoids the fresh peaches, the fuzzy skin
brushing against his lips makes Melville think that he's eating a small
rodent.
The comma between season and Melville is completely correct. When a variety of fruit is in season is a subordinate clause. It must be connected to a main clause. Melville always avoids the fresh peaches is the necessary main clause that completes the thought.
Go back to the sentence to try again.