Which condition can lead to increased pest pressures in turfgrass?

The presence of invasive species dominance can significantly contribute to increased pest pressures in turfgrass. Invasive species often have characteristics that allow them to outcompete native plants, which can disrupt the local ecosystem balance. When invasive plants proliferate, they can provide habitat and resources that are favorable for pests and diseases, resulting in higher pest populations. This can lead to increased competition for resources, stress on the turfgrass, and ultimately greater vulnerability to pests. Furthermore, invasive species can alter the soil composition and microclimate, further exacerbating the issues faced by the turfgrass.

In contrast, high biodiversity typically helps to stabilize ecosystems and can limit the establishment and spread of pests. Proper soil moisture is crucial for maintaining healthy turf and does not inherently increase pest pressure; instead, both underwatering and overwatering can lead to stress, but proper moisture generally supports healthy grass. Frequent mowing is a cultural practice that can promote healthy turf by encouraging dense growth, reducing pests, and providing an opportunity for pest control if done correctly.