Step 1: Understanding the Concept:
Many fruit-bearing trees, including apples, are entomophilous, meaning they require biotic agents (insects) for pollination.
Step 2: Detailed Explanation:
Bees are the primary pollinators for apple orchards.
A decrease in the bee population due to pesticides prevents the transfer of pollen from the anther to the stigma, leading to a failure in fertilization and subsequent fruit development.
The logical solution is to stop using harmful pesticides and restore the pollinator population by placing bee hives (apiculture) in the orchard during the flowering season.
Step 3: Final Answer:
Insect pollination is the affected process, and the remedy is reducing pesticide use and introducing hives.