Which of the following is NOT an example of controlling plant diseases?

Seeding is focused on the act of planting seeds to establish crops or plants rather than managing or controlling diseases that may affect those plants. In contrast to the other choices, which are methods used to mitigate the risk or impact of plant diseases, seeding does not directly address disease management.

Cultivation involves practices such as tilling and soil preparation, which can help reduce disease by improving soil health and reducing pathogen populations. Deep plowing can disrupt the life cycles of certain soil-borne pathogens and expose them to environmental conditions that are detrimental to their survival. Sanitation encompasses strategies like cleaning tools and removing infected plant material to prevent the spread of diseases.

Thus, while seeding is essential for starting plant growth, it does not fall under the category of controlling plant diseases.