What is an example of a biologic control disease organism?

A biologic control disease organism refers to an organism that is used to control pest populations by exploiting natural relationships. Fungi are a prominent example of this, as certain species can be pathogens to pest insects, thereby reducing their populations. For instance, entomopathogenic fungi infect and kill insects, serving as a natural control method without the need for synthetic pesticides.

The other options represent various forms of control but do not fit the description of a biologic control disease organism. Weeds are considered pests but not organisms used for control. Pesticides are synthetic or natural substances used to eliminate pests but are not classified under biologic controls themselves. Mechanical traps function as physical devices to capture pests and, while effective, do not involve the use of biological organisms in the control process. Thus, fungi as a biologic control organism exemplify the use of natural pathogens to regulate pest populations effectively.