How is St. Augustine Decline primarily spread?

St. Augustine Decline is primarily spread through mowers, which is closely related to the process of mechanical transmission. When mowing lawns affected by the decline, the mower blades can pick up and spread infected plant material, including leaves and stems that may harbor the pathogens associated with the decline. This mechanical spread is a significant concern for lawn care professionals and homeowners because it can lead to the introduction of the disease into previously healthy areas of the lawn.

In contrast, water runoff, soil transfer, and wind are less effective mechanisms for spreading St. Augustine Decline. Water runoff may carry some pathogens but typically spreads them over larger areas, making it less direct than mower transmission. Soil transfer can occur, but it is more relevant for pests or pathogens that are either soil-borne or require root contact, which does not apply to St. Augustine Decline primarily. Wind can disperse spores or small particles, but again, mowers present a more direct and frequent means of spreading this particular decline. Understanding this method of transmission is crucial for preventing outbreaks and maintaining healthy turf.