Which of the following is NOT a factor that influences disease development in turfgrass?

The correct answer identifies maintenance frequency as not directly influencing disease development in turfgrass. While maintenance practices such as mowing, fertilization, and irrigation certainly impact the overall health and resilience of turfgrass, they do not directly affect the development of diseases in the same way that environmental factors do.

Soil temperature plays a critical role because many turfgrass pathogens thrive at specific temperature ranges, affecting spore germination and plant susceptibility. Moisture levels are also crucial since excess humidity or standing water can create a conducive environment for fungal diseases to develop. The foliage growth stage relates to the vulnerability of the grass; certain growth phases may leave turfgrass more susceptible to specific diseases based on its physiological state.

Maintenance can help mitigate disease impacts, but it does not inherently cause or prevent disease development on its own, making it the best choice for this question.