Integrated pest management (IPM) uses multiple, complementary tactics to keep pest populations below damaging levels. Effective IPM relies on identifying pests, monitoring trends, and selecting targeted controls that fit the crop, climate, and local ecosystem.

What “tools and techniques” means in IPM

IPM is a toolkit rather than a single method. The goal is to reduce pest damage by combining approaches that:

• Prevent pests from becoming established

• Suppress populations that are increasing

• Disrupt pest life cycles and movement

• Target pests while reducing impacts on non-target species (including pollinators and natural enemies)

Key decision idea: intervene only when needed

Economic thresholds make monitoring meaningful: they connect field observations to action, helping avoid unnecessary treatments.

This graph illustrates how an action threshold (economic threshold) is set below the economic injury level (EIL) so that intervention happens before losses exceed control costs. It emphasizes that IPM decisions are triggered by monitoring trends over time, not by routine spraying. The figure helps distinguish “when to act” (threshold) from “when damage becomes economically unacceptable” (EIL). Source

Monitoring and identification (the foundation for choosing tools)

Before selecting any technique, IPM depends on accurate information.

• Correct pest identification (species and life stage) to match the control method (e.g., larva vs. adult)

• Scouting and sampling (visual counts, sweep nets, sticky cards)

• Traps and lures (e.g., pheromone traps) to detect presence and timing of outbreaks

• Recordkeeping to track seasonal patterns, hotspots, and the effectiveness of prior controls

Monitoring results guide which combination of biological, physical, cultural, and limited chemical controls is most appropriate.

Biological controls (biocontrol)

Biocontrol uses living organisms to reduce pest populations by predation, parasitism, or disease.

Biological controls commonly include:

This image set depicts a lady beetle acting as a predator (a common biological control agent) and shows its complete metamorphosis life cycle (egg, larva, pupa, adult). The life-cycle diagram supports IPM timing: different stages vary in feeding intensity and effectiveness against pests such as aphids. It also reinforces why correct identification of life stage matters when selecting a control tactic. Source

• Predators: consume many prey (e.g., lady beetles feeding on aphids)

• Parasitoids: lay eggs in/on pests, eventually killing them (often small wasps)

• Pathogens: infect pests (e.g., bacterial, fungal, or viral agents)

Encouraging natural predators (conservation biocontrol)

Instead of releasing organisms, conservation biocontrol changes the farm environment to support natural enemies.

• Provide habitat (hedgerows, flowering strips) for shelter and nectar

• Reduce practices that disrupt beneficial populations (e.g., broad-spectrum treatments)

• Maintain refugia (areas where beneficials persist when fields are disturbed)

Physical and mechanical controls

Physical approaches reduce pests by blocking, removing, or killing them directly, often with minimal chemical input.

• Barriers: row covers, netting, or screens to prevent pest access

• Traps: sticky traps, baited traps, or mass-trapping systems

• Mechanical removal: hand-picking, vacuuming insects, pruning infested plant parts

• Tillage as a targeted tool: disrupts soil-dwelling stages for some pests (used selectively to avoid unnecessary soil disturbance)

These methods are most effective when timed to vulnerable pest stages identified through monitoring.

Cultural controls: intercropping and crop rotation

Cultural controls change farming practices to make conditions less favorable for pests.

Intercropping

Intercropping grows two or more crops together to reduce pest success by disrupting host finding and spread.

• Masking and confusion: pests have more difficulty locating the host crop

• Reduced pest movement: mixed plant structure can slow dispersal

• Support for beneficials: additional plant diversity can provide nectar and habitat

Crop rotation

Crop rotation alternates crops over seasons to break pest life cycles, especially for pests with limited host ranges.

• Removes the pest’s preferred host from a field

• Reduces overwintering or carryover populations

• Can lower disease and nematode pressures when rotations include non-host crops

Rotation works best when paired with knowledge of pest biology (host specificity, survival time in soil, and dispersal ability).

Limited chemical controls (used strategically within IPM)

IPM does not eliminate pesticides; it limits and targets them to reduce selection for resistance and non-target harm.

• Choose selective products when possible (narrower effects on beneficial insects)

• Use the lowest effective dose and appropriate timing (e.g., early instars)

• Prefer spot treatments or edge treatments when infestations are localized

• Rotate modes of action to slow pesticide resistance development

• Avoid spraying during peak activity of pollinators and natural enemies

Chemical controls are typically the last step after prevention and non-chemical suppression options have been applied or ruled out by monitoring data.

Integrating techniques into a coherent plan

IPM tools are strongest when combined:

• Monitoring identifies the pest and timing

• Cultural practices (rotation, intercropping) reduce baseline risk

• Biological controls and predator support suppress growth

• Physical controls reduce immediate pressure

• Limited chemicals are used only when thresholds are exceeded and targeted options are needed