Which of the following pesticides does not require federal or Oregon registration?

Low-risk ingredients are classified in such a way that they do not require registration at the federal level or in Oregon. These substances typically have a lower potential for harm to human health and the environment, which allows them to bypass the stringent registration processes required for more hazardous pesticides. The justification for this exemption stems from the understanding that low-risk pesticides pose minimal risk and therefore do not need the same level of scrutiny or regulation as highly toxic pesticides or other classes that may have significant adverse effects.

On the other hand, highly toxic pesticides necessitate comprehensive evaluation and registration due to their potential risks to human health and the environment. Microencapsulated pesticides are customarily subject to registration because their delivery mechanisms can affect exposure and efficacy. Insect growth regulators, despite being less toxic than other pesticides, are still governed by regulations that require registration to ensure safety and effectiveness in pest control. Thus, the distinction for low-risk ingredients lies in their inherent properties that minimize risks, leading to their exemption from registration requirements.