Pennsylvania State Extension Cool-Season Turfgrass Pest Management Practice Test 2025 - Free Turfgrass Pest Management Practice Questions and Study Guide

Sparse growth is a common reason for weed germination in turfgrass areas because it creates an environment where weeds can thrive. When turfgrass is not dense or healthy due to insufficient growth, it leaves open spaces for weeds to establish and proliferate. Healthy and vigorous turfgrass competes more effectively against weeds for light, water, and nutrients. Therefore, when the growth is sparse, weed seeds, which are often already present in the soil, can take advantage of the lack of competition and germinate more successfully.

In contrast, over-watering can lead to other issues such as disease or root rot which may harm the grass but does not directly encourage weed germination. High soil compaction restricts root growth and affects overall turf health, making it difficult for the grass to thrive, but it does not inherently promote weed germination. Excessive fertilization may encourage turfgrass growth but can also lead to nutrient imbalances or encourage certain fast-growing weeds rather than directly causing germination. Ultimately, it is the lack of robust turfgrass that creates opportunities for weed seeds to germinate and grow, making sparse growth the most relevant factor in this context.