Pest Control Technician Practice Exam 2026 – Complete Prep Guide

The granary weevil is well-known for its detrimental impact on stored grains, particularly in warehouses and grain bins. This insect specifically targets crops like wheat, corn, and barley, where it lays its eggs inside the grains. The larvae then hatch and consume the grain from the inside, leading to significant losses. Their ability to reproduce quickly and thrive in stored grain environments makes them particularly challenging to control and manage, further contributing to their reputation as a major pest in the grain industry.

In contrast, although the corn borer can damage corn crops, it primarily affects plants in the field rather than stored grain. The housefly, while a pest, does not directly target grain and is more associated with hygiene issues and the spread of disease. The potato beetle primarily affects potato crops and does not have a significant impact on grain storage. Thus, the granary weevil stands out as the primary insect responsible for causing considerable damage to grain.