Biological control agents differ in life cycle, feeding behavior, seasonal activity, and impact on target weeds, so monitoring methods must be species‑specific. Some agents are best assessed by counting adults, others by evaluating larval presence or characteristic feeding damage. Because each agent interacts differently with its host plant and environment, standardized monitoring approaches are tailored by species to ensure accurate and meaningful data collection. See the Biocontrol Agent Monitoring Guides section below for species-specific SIMP instructions. The general SIMP Monitoring Form can be downloaded from the bottom of this page.