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Integrated pest management (IPM)

Also known as IPM, The IPM ladder

Growing know-howDepends
Yellow sticky traps used to monitor pests, a key step in IPM Photo: USDAgov · Public domain

In short

IPM is a long-term approach to pests that starts with prevention and correct identification, monitors plants, decides whether action is actually needed, and then uses the least harmful effective controls first: cultural, mechanical and biological, with pesticides only when needed and chosen to minimise risk.

How it looks

The IPM steps: 1) prevent problems (healthy plants, pest-free purchases, quarantine); 2) monitor regularly and identify what you find, since many organisms are harmless or beneficial; 3) set an action threshold, the point where damage justifies action (for houseplants, often aesthetic); 4) control, starting with the least harmful methods.

Signs

Monitoring tools: close inspection of leaf undersides, new growth and leaf joints; a hand lens; yellow sticky cards to catch flying pests such as fungus gnats, whiteflies and thrips; checking roots at repotting.

What favours it

Pests take hold most easily on stressed plants (wrong light, watering or humidity) and arrive most often on newly acquired plants. Warm indoor and tropical conditions let many pests breed year round.

Prevention

  • Buy healthy plants and quarantine newcomers.
  • Grow plants in the right light, water and humidity so they are less susceptible.
  • Inspect plants weekly and keep records of problems.
  • Keep tools clean and remove dead leaves and fallen debris.
  • Learn to recognise beneficial and harmless creatures before acting.

Treatment

Start with the first step and move down only if the problem persists.

  1. Cultural: correct watering, light and humidity; let mix dry to discourage fungus gnats; isolate affected plants.
  2. Mechanical/physical: hand-pick, prune out infested parts, wash plants with water (Colorado State notes small plants can be dunked), wipe or swab pests (alcohol on a cotton swab for mealybugs), use sticky traps.
  3. Biological: natural enemies such as predatory mites, ladybirds, lacewings and parasitoid wasps, or microbial products such as Bacillus thuringiensis where appropriate.
  4. Chemical, last: insecticidal soaps (potassium salts of fatty acids) and horticultural oils act on contact with little residue; systemic insecticides are a last resort. Follow the product label.
  5. Discard plants when infestation is severe and control is impractical (for example cyclamen mite).

Pros and cons

Pros

  • Fewer pesticide applications, less risk to people, pets and beneficial insects, and more lasting control.

Cons

  • Needs regular observation and correct identification; results can be slower than a single spray.

Look-alikes

Springtails
Harmless soil creatures often mistaken for pests; no treatment needed.
Predatory mites
Beneficial mites that eat pest mites; do not spray them.

Typical uses

All plants, indoors and outdoors.

Sources

  1. What Is Integrated Pest Management (IPM)? — UC Statewide IPM Program
  2. Integrated Pest Management (IPM) Principles — US EPA
  3. Managing Houseplant Pests — Colorado State University Extension

Written in our own words from these sources. Check a product label before using any treatment.