What characteristic primarily distinguishes organic pesticides from synthetic ones?

The characteristic that primarily distinguishes organic pesticides from synthetic pesticides is that organic pesticides are derived from natural sources. This means that they are formulated from naturally occurring substances, which can include plants, minerals, and other biological materials. This natural origin generally appeals to those seeking environmentally friendly and sustainable pest management solutions.

While the other factors mentioned, such as effectiveness and cost, can vary and may influence a person's choice between organic and synthetic pesticides, they do not define the fundamental difference between the two categories. The classification of pesticides as organic or synthetic hinges on their origin and composition rather than performance or price. Thus, the correct understanding revolves around the source of the pesticide, which is what sets organic pesticides apart.