1. Produced or stocked in large quantities to meet steady demand: Wheat is a staple crop.

Are apples a staple?
What about soybean, brocoli, apparagus, lettuce?
No. Staple crops are foods that provide a large proportion of people's basic food. Staples will vary across the world but include wheat, rice, potatoes, yams, and so on. It's usually the carbs part of the meal.
Unbelievable! The dictionary is a piece of trash. You can write a better dictionary.
Thanks, Nona.