Pheromone Trap Calculator & Traps, Spacing & Lures

For monitoring (detecting and timing pests), about 4–5 traps per acre is typical. For mass trapping (actually suppressing the pest population), you need many more — roughly 15–25 per acre. This tool multiplies your chosen density by the area to give the total traps and the spacing between them.

Monitoring uses a few traps to detect when a pest arrives and how its numbers change, so you can time sprays to the economic threshold. Mass trapping uses a high density of traps to capture enough adults (usually males) to reduce mating and cut the next generation — a control method in itself.

It depends on density: monitoring traps at 4–5/acre sit roughly 25–30 m apart, while mass-trapping at 20/acre is much closer (~14 m). The tool computes the approximate spacing from your traps per area so you can lay out an even grid across the field.

Lures lose their pheromone over time — commonly every 2–6 weeks (check the product). Over a season you'll change them several times: the tool divides the season length by the lure life to give the number of lure changes and the total lures needed, so you can buy enough.

At the crop canopy height (raise them as the crop grows), spread evenly across the field including the borders where pests often enter first, and away from strong wind that disperses the plume. Keep traps clean and check them regularly — weekly for monitoring.

Many moth and fly pests have species-specific lures — fruit flies, fruit and shoot borers, bollworm/Helicoverpa, diamondback moth, pink bollworm, tuta absoluta and more. Use the correct lure for your target pest; the trap design (delta, funnel, water/yellow sticky) is matched to the pest too.

Monitoring traps don't control pests — they tell you when to act. Mass trapping can reduce the need for sprays but usually works best as part of integrated pest management (IPM) alongside scouting, thresholds and selective sprays. They cut, rather than eliminate, the need for chemicals.

Fruit-fly mass trapping commonly uses around 15–25 traps per acre (some programmes more), with methyl eugenol or cue-lure plus a killing agent. Set the mass-trapping density in the tool and it gives the traps, spacing and lures for your orchard area.

Often yes — monitoring traps are cheap insurance that prevent wasted, mistimed sprays, and mass trapping can cut chemical and damage costs. Enter trap and lure prices to see the season cost; weigh it against the sprays and crop loss avoided (the Economic Threshold tool helps).

The trap body is usually reusable for a season or more; only the lure (and sticky liner, if used) is replaced periodically. So your main recurring cost is lures. The tool separates traps (one-off) from lures (recurring) so you can budget both correctly.