1. Apples and Pumpkins by Anne Rockwell
This book is great to use as a preview or review of a visit to an apple orchard or a pumpkin patch. Let kids tell you about what they see in the pictures as you read. When my daughter and I read this we also painted an apple and pumpkin.
2. Apple Farmer Annie - Monica Wellington
This book follows apple farmer Annie as you grows apples in her orchard to selling her apple products at a farmer's market. I enjoyed reading this book on the days we would visit the farmer's market. It was a great way to build on our conversation at the market and as we drove home. The font in this book was also very toddler friendly.
3. Apples by Gail Gibbons
This book was a little more advanced but the detailed pictures allow for great discussion on the types and parts of an apple. This would be a great book to use alongside an apple tasting. You could use the tasting as an introduction into opinions, data collection, and graphing.