Georgia Pesticide Applicators Practice Exam

What are nematodes?

1. Large insects damaging foliage

2. Small, microscopic roundworms damaging roots

3. Fungi affecting plant growth

4. Pathogens causing plant diseases

The correct answer is: Small, microscopic roundworms damaging roots

Nematodes are indeed small, microscopic roundworms that primarily target plant roots. They can be either beneficial or harmful, but in the context of this question, it is the damaging aspect that is emphasized. Plant-parasitic nematodes can invade and feed on the roots of plants, leading to stunted growth, nutrient deficiency, and even plant death. Their tiny size allows them to inflict damage that is often not immediately visible, making them particularly troublesome for gardeners and farmers. The other options present various organisms that can affect plants but do not accurately describe nematodes. Insects can damage foliage directly above ground, fungi may influence plant health through various mechanisms but are not classified as roundworms, and pathogens typically refer to organisms that cause diseases in plants without being specific to the structure or type of damage associated with nematodes. Thus, the description of nematodes as small, microscopic roundworms damaging roots is the most accurate in understanding their role in plant health and agriculture.