Which nonchemical method can reduce spittlebug numbers in turf?

Dethatching is an effective nonchemical method to reduce spittlebug numbers in turf because it directly addresses their habitat. Spittlebugs are often found in thatchy areas, where they can thrive and reproduce. By dethatching the turf, you remove the thick layer of dead grass, organic matter, and debris that provide shelter and breeding grounds for these pests. This process not only disrupts their life cycle but also promotes a healthier lawn environment, making it less conducive to pest populations.

In contrast, while insecticidal soap can kill existing spittlebugs, it is a chemical control method and not considered a nonchemical strategy. Fertilizing can promote grass growth but does not significantly affect spittlebug populations directly. Watering deeply may improve overall turf health but does not specifically target spittlebug infestation or reduce their numbers. Therefore, dethatching stands out as the method that effectively reduces spittlebug populations without the use of chemicals.