Ornamental and Turf Pesticide Applicators Practice Exam

What environmental condition can exacerbate root parasitic nematode problems?

1. Well-drained soil

2. Low irrigation

3. High humidity

4. Excess sunlight

The correct answer is: High humidity

High humidity can exacerbate root parasitic nematode problems because nematodes thrive in moist environments, which can promote their survival and reproduction. When humidity levels are elevated, it can lead to increased moisture in the soil, creating an ideal habitat for these pests. This environment allows nematodes to more readily infect plant roots, resulting in more significant damage and higher populations. Well-drained soil, on the other hand, tends to reduce nematode populations because it does not retain excess moisture, making it less hospitable for their growth. Similarly, low irrigation limits available water, further hindering nematode proliferation. Excess sunlight may also dry out the soil, making conditions less favorable for nematode activity. Therefore, high humidity is the primary environmental condition that can worsen problems associated with root parasitic nematodes.