What is a common method for spreading Fire Blight bacteria?

Fire Blight is a bacterial disease primarily affecting plants in the rose family, such as apples and pears. The primary method for the spread of Fire Blight bacteria, specifically Erwinia amylovora, is through environmental factors and physical actions that facilitate its transmission. Wind-blown rain plays a significant role in dispersing the bacteria from infected plant material to healthy plants. Insects can also contribute to the spread as they move from infected to healthy areas, often carrying the bacteria. Pruning tools that have been contaminated with the bacteria can further spread the disease during the trimming of plant materials.

This multifaceted spread through natural vectors and human activity underscores the importance of managing these elements to prevent the disease's transmission. Other options, while they address potential ways of transmission, do not align with the primary pathways recognized for Fire Blight. For instance, direct sunlight does not influence the bacteria's spread, and contaminated watering sources primarily affect water-borne pathogens rather than bacterial diseases like Fire Blight. Planting infected seeds is theoretically possible but less common as seeds are not typically a vector in the same way as physical contact and environmental means. Thus, the correct answer emphasizes the most prevalent and significant transmission routes for this specific bacterial disease.