Which of the following chemicals would NOT be used for controlling bacterial diseases?

Fungicides are specifically designed to target and control fungal diseases, not bacterial diseases. Since bacterial pathogens are distinct from fungi, fungicides are ineffective against them. This makes fungicides unsuitable for addressing issues caused by bacteria.

In contrast, bactericides are formulated to kill bacteria, and antibiotics can also be effective in combating bacterial diseases. Soil fumigants are utilized to manage a variety of soilborne pests and diseases, including some bacterial pathogens, but they are not classified under any of the other types listed as specifically targeting bacteria. Therefore, fungicides are the only choice on the list that does not serve a purpose in controlling bacterial diseases, confirming that it is not appropriate for this context.