All of the following are examples of antimicrobial pesticides except?

Antimicrobial pesticides are specifically designed to control microbial pests, including bacteria, fungi, and viruses. In the context of this question, the term "antimicrobial" includes products that target specific types of microorganisms.

Fungicides are designed to combat fungi, and bactericides target bacteria, making them both types of antimicrobial pesticides. Insecticides, while they do deal with pests, specifically target insects rather than microorganisms.

Algaecides, on the other hand, are employed to control algae, which may not fall into the category of traditional microbial pests in the same way that bacteria and fungi do. Therefore, they are not typically classified under antimicrobial pesticides aimed specifically at managing microbial threats. By understanding the roles of these various types of pesticides, one can see why algaecides are the outlier among the given choices.