Pests, the IPM way

Integrated pest management (IPM) means preventing problems, checking often, and using the gentlest effective fix first. On a balcony that usually means water, fingers and patience before any spray.

What IPM means

The University of California’s IPM programme describes IPM as an ecosystem-based strategy focused on long-term prevention of pests or their damage. It combines biological control (natural enemies), cultural control (for example adjusting watering, since overwatering encourages root disease), mechanical and physical control, and chemical control. In IPM, pesticides are used only when needed and alongside other methods.

Source: University of California Statewide IPM Program, checked 26 October 2026.

Step 1: look regularly

Illinois Extension recommends scouting plants occasionally for pests. Turn leaves over and look along stems and new growth, where many pests cluster. Our plant pages note the pests each plant’s source lists.

Source: University of Illinois Extension, checked 26 October 2026.

Step 2: know the usual suspects

Aphids: Small, soft, pear-shaped insects on new growth and leaf undersides; feeding yellows, distorts and stunts leaves. Knock them off with a spray of water, repeated a few times (Illinois Extension).
Mealybugs: Covered in white, powdery wax, often under leaves along the main vein; they leave sticky honeydew that grows sooty mould. Wipe them off, or remove them with tweezers or a cotton bud dipped in alcohol (Illinois Extension).
Scale: Immobile insects under a waxy shell like a fish scale. Scrape off a few with a fingernail or a plastic card (Illinois Extension).
Spider mites: Tiny (about 0.5 mm), with fine webbing and speckled or mottled leaves. Wipe leaves with a damp cloth or spray with water repeatedly (Illinois Extension).
Whiteflies: Tiny white insects that fly up when a plant is disturbed; the flat, oval young stay put on leaf undersides and do most of the damage. Look for sticky honeydew, sooty mould and yellowing leaves. Hose adults off, prune out the first infested leaves, and use yellow sticky traps to monitor them (UC IPM).
Fungus gnats: Small black flies around pots. Illinois Extension says they rarely damage plants and usually signal mix that stays too wet: let it dry between waterings. Sticky traps help you monitor them but will probably not clear them alone.

Source: University of Illinois Extension; University of California Statewide IPM Program, checked 26 October 2026.

Step 3: if you must spray

Start with insecticidal soap or horticultural oil for soft-bodied pests. UC IPM notes they kill only the insects they touch, so spray leaf undersides thoroughly.
Mind the heat. UC IPM advises using soaps and oils only on plants that are not drought-stressed and when temperatures are below 90 °F (about 32 °C), which rules out many Indian summer afternoons.
Spare the helpers. UC IPM advises avoiding broad-spectrum insecticides, which kill natural enemies, and says not to spray when natural enemies are already present.
Use only labelled products. Illinois Extension says to use only products labelled for the plants and setting (such as indoor plants) and to follow the label. In India, insecticides are registered by the Registration Committee set up under Section 5 of the Insecticides Act, 1968, which checks formulations and claims of efficacy and safety.
Keep sprays away from children, pets and food, and store them as the label says.

Source: University of California Statewide IPM Program; University of Illinois Extension; Directorate of Plant Protection, Quarantine & Storage, Government of India, checked 26 October 2026.

Step 4: know when to stop

For a severe infestation, Illinois Extension says it may be best to discard the plant and replace it, rather than keep spraying and risk the pests spreading to the rest of your collection.

Source: University of Illinois Extension, checked 26 October 2026.

Plant-specific pests in this guide

Some crops have their own pests. TNAU lists bud worm, leaf webber and blossom midge on mogra; NC State lists flea beetles on brinjal and radish, and whiteflies on tomato, chilli and okra. Each plant page lists what its source reports.

Source: TNAU Agritech Portal, Tamil Nadu Agricultural University; NC State Extension; NC State Extension; NC State Extension; NC State Extension; NC State Extension, checked 26 October 2026.

General gardening information, not professional advice. Plant toxicity details are a starting point, not veterinary or medical advice: if a pet or child may have eaten a plant, contact a veterinarian or doctor promptly.