Associate Certified Entomologist (ACE) Practice Exam

What effect do neonicotinoids have on bees?

1. They are harmless at low doses

2. They cause irritation to bees

3. They are very toxic at low doses

4. They induce hyperactivity in bees

The correct answer is: They are very toxic at low doses

Neonicotinoids are a class of insecticides that mimic nicotine and are known to interfere with the normal functioning of the nervous system in insects, including bees. Research indicates that even at low doses, neonicotinoids can be highly toxic to bees. They affect the synaptic transmission in the nervous system, leading to detrimental effects such as impaired foraging behavior, reduced reproductive success, and increased mortality. The significant toxicity of neonicotinoids at low concentrations has led to concerns about their impact on bee populations and overall pollinator health. Regulatory bodies and researchers emphasize these risks, advocating for careful use of such insecticides to protect pollinators. Understanding the effects of neonicotinoids is critical for those in pest management and related fields, as they play a pivotal role in the health of ecosystems reliant on pollination. In contrast to the other choices, the assertion that neonicotinoids are harmless at low doses does not reflect current research findings. The claim of causing mere irritation overlooks the broader and more serious toxicological effects they have. Additionally, while some studies may note behavioral changes in bees, such as hyperactivity, the overwhelming consensus is that the primary concern lies in their overall toxicity rather than just inducing hyperactivity