Likely answer

Children's Book About a Boy Befriending an Alien in an Apple Orchard

The book you are looking for is The Space Ship Under the Apple Tree by Louis Slobodkin, first published in 1952. It tells the story of a young boy on a farm who discovers an extraterrestrial craft in an apple orchard and befriends the visiting alien.

Confirmed match: The space ship under the apple tree by Louis Slobodkin