Integrated pest management is a way of deciding, not a single method: watch the crop regularly, identify what is causing damage, intervene only when the damage will meaningfully cut the harvest, and use the least disruptive control first. The aim is to keep pest damage below the level that threatens the community’s food, not to remove every pest, because a farm with no pests also has no predators.
Integrated pest management is a decision framework that combines monitoring, thresholds and a graded set of controls.
IPM Is A Ladder, Not A Recipe
The carrier sets out four steps: monitor, identify, apply a threshold, and act with the least disruption first. Each rung has its own article.
- Monitor. Walk the crops often and look under leaves, at stems, fruit and soil (Monitoring and Identification).
- Identify. Decide whether the damage matters and what is causing it. A few holes in kale leaves are not a crisis, and some insects on the plant are friends.
- Apply a threshold. Act when the pest level will reduce the harvest, not when you first see it (Action Thresholds).
- Act, starting with the gentlest tool. Handpick, use barriers and traps, then encourage natural enemies, and only then consider anything stronger (Physical Controls, Biological Controls).
The steps before the ladder are the cheapest: choose adapted varieties, rotate crops (Crop Rotation for Disease Break), keep soil healthy and plant extra, since a 20% allowance for crop failure and pests is part of the community land plan (Buffer for Crop Failure and Pests).
Why Not Kill Everything
Pests are food for predators. A stand that is sprayed or picked clean also loses the ladybirds, lacewings, ground beetles and parasitic wasps that hold the next outbreak down. Poisons make this worse because they kill natural enemies and pollinators along with the pest, and a pest that breeds faster than its enemy recovers can return stronger. The practical aim is tolerance: accept a level of damage that costs less than the control.
A Daily Pest Patrol Costs Little
The carrier suggests assigning children and older adults to a daily patrol with a bucket of soapy water for handpicking beetles and caterpillars (Children and Elderly Roles). It catches problems while they are small, which is the cheapest time.
Botanical Sprays Are Still Poisons
Sprays made from plants are not automatically safe. They kill beneficial insects, and some are dangerous to the person who mixes and applies them.
Tobacco "tea" and other plant insecticides can poison people
Nicotine is acutely toxic to humans and is absorbed through intact skin: pickers who handle wet tobacco leaves develop “green tobacco sickness” (nausea, vomiting, weakness, dizziness) from skin contact alone. Soaking tobacco leaves and spraying the liquid exposes the person who mixes, carries and sprays it, and the strength of a home brew is unknown and cannot be controlled. Rotenone is a fish poison and mitochondrial inhibitor, and pyrethrum is toxic to bees and fish. Do not use tobacco extract. If you ever use any plant insecticide, the strength, the protective clothing and the waiting time before harvest must come from a tested source, not from a recipe passed by word of mouth; this guide gives no strength for any of them because none is sourced. Keep children and animals away, and wash exposed skin at once with soap and water.
The existing Phase 2 pest guide lists a tobacco-leaf soak among its plant sprays without a strength (Pest Control); read that entry with this warning in mind.
Common Mistakes
- Treating on first sight. Most early damage never costs yield.
- Never looking. A pest found at 20% damage is a lost season.
- Using a spray before a hand. Handpicking and barriers are cheaper and safer.
- Copying a recipe for strength. If you cannot say where the number came from, do not use it.
What’s Next
- Learn next: Monitoring and Identification — the first rung
- Combine with: Pest Control — the Phase 2 methods in full