Ornamental and Turf Pesticide Applicators Practice Exam

What negative effect do root parasitic nematodes have on plants?

1. Promote flowering

2. Enhance nutrient uptake

3. Cause general decline or stunting

4. Increase fruit yield

The correct answer is: Cause general decline or stunting

Root parasitic nematodes have a detrimental impact on plants primarily by causing general decline or stunting. These microscopic worms invade plant roots and feed on the plant's cells, which disrupts normal root function. As a result, affected plants struggle to absorb water and essential nutrients, leading to weakened growth and overall health. This stunting effect can manifest in smaller leaves, reduced vigor, and, over time, lower resistance to other stresses such as diseases and environmental changes. Promoting flowering, enhancing nutrient uptake, and increasing fruit yield are all positive effects that healthy plants would experience under optimal conditions, but root parasitic nematodes do the opposite by inhibiting these processes and negatively impacting plant development.