Which action is recommended for preventing plant diseases?

Removing the source of the pathogen is a highly effective action for preventing plant diseases because it directly addresses the cause of the problem. By eliminating potential sources of infection, such as diseased plant material, infected soil, or contaminated tools, you significantly reduce the chances of disease spread and outbreak. This proactive measure helps to maintain a healthier environment for the plants, leading to better growth and productivity.

Additionally, while increasing moisture in the canopy can be beneficial in certain growth situations, it can also create conditions that promote disease if not managed properly. Similarly, using minimal pesticides is more a strategy of management than prevention, and planting varieties that are known to be susceptible can increase the risk of diseases taking hold. Therefore, actively removing potential sources of pathogens is essential in disease prevention strategies.