Biological Control & Beneficials per Acre
Releases Trichogramma
Enter your area, release rate per acre and number of releases to get the beneficials per release, the season total and the trichocards you need to buy.
Set up your release
Next: release in the evening near egg-laying, repeat every 7–10 days for the recommended number of releases, and avoid broad-spectrum sprays that kill the beneficials.
Rates are typical IPM recommendations (e.g. Trichogramma ~50,000/acre/release); confirm with local advisories and the pest's threshold.
Biocontrol release — key facts
- Per release
- rate/acre × area
- Season total
- per release × releases
- Trichogramma rate
- ≈ 50,000/acre/release
- Releases
- ≈ 6 over the season
- Card capacity
- ≈ 20,000 eggs/card
- Repeat
- every 7–10 days
- Release time
- evening, near egg-laying
- Privacy
- Runs in your browser; nothing uploaded
Let nature's pest control do the work
Every crop has natural enemies waiting to work for it — tiny Trichogramma wasps that destroy borer and bollworm eggs, lacewings and ladybirds that devour aphids and mealybugs. Augmentative biological control simply tops up their numbers, releasing reared beneficials at a set rate per acre, again and again through the pest's active period, so they stay ahead of the damage. Get the quantity right and you keep pests below the economic threshold with far less spraying.
This tool turns a release rate into real numbers: the beneficials per release, the season total, and the trichocards you need to order for your area and schedule. Set it for Trichogramma, Chrysoperla, Cryptolaemus, Cotesia or Bracon, release in the evening near egg-laying, repeat every 7–10 days, and avoid broad-spectrum sprays that wipe out the helpers. Pair it with the Economic Threshold, Pheromone Trap and Neem Oil tools for a complete IPM plan.
Order the right amount
Know the cards and counts before you buy.
Stay ahead of pests
Repeat releases through the active period.
Spray far less
Beneficials cut reliance on insecticides.
Protect the helpers
Avoid broad-spectrum sprays around releases.
Frequently Asked Questions
What is biological control release?+
Augmentative biological control means releasing reared natural enemies — parasitoids or predators — onto a crop at a set rate per acre, repeated through the pest's active period, so they multiply and keep the pest below the level that causes loss. It's a core tactic in integrated pest management (IPM) and reduces reliance on chemical sprays.
How is the release quantity calculated?+
Per release = release rate per acre × your area. Season total = per release × number of releases. For Trichogramma a typical rate is about 50,000 per acre per release over roughly 6 releases, so 1 acre needs around 300,000 over the season. The tool also converts that into the number of cards you need to buy.
What is Trichogramma and what does it control?+
Trichogramma is a tiny egg parasitoid that lays inside the eggs of moth pests, killing them before the caterpillar ever hatches. It's used against stem borers, fruit and shoot borers, and bollworms in crops like sugarcane, rice, maize, cotton and vegetables. It is supplied on small cards (trichocards) glued with parasitised eggs ready to emerge.
How many eggs are on a trichocard?+
A standard trichocard carries about 20,000 parasitised eggs. So a 50,000-per-acre release works out to roughly 2.5 cards per acre per release. The tool divides your per-release count by the eggs per card to tell you how many cards to order — round up, since you can't buy a fraction of a card.
Which other beneficials can I release?+
Chrysoperla (green lacewing) larvae are voracious predators of aphids, whiteflies and small caterpillars; Cryptolaemus montrouzieri (the mealybug destroyer) is a beetle predator of mealybugs and scales; and Cotesia and Bracon are larval parasitoids of caterpillars. Each has its own recommended release rate, which you can enter directly into the calculator.
When should I release beneficials?+
Release in the cool of the evening or early morning so the agents are not stressed by heat and sun, and time it to coincide with the pest's egg-laying so parasitoids find fresh eggs. Begin at the first sign of the pest or on a preventive schedule rather than waiting for a heavy infestation, when biocontrol struggles to catch up.
How often do I repeat releases?+
Typically every 7–10 days through the pest's active window, which is why Trichogramma programmes usually run about 6 releases. Frequent, smaller releases keep a standing population of natural enemies in the field and match the pest's overlapping generations better than one large drop.
Can I spray pesticides at the same time?+
Avoid broad-spectrum insecticides around releases — they kill the beneficials you just paid for along with the pest, leaving the crop worse off. If a knock-down spray is unavoidable, use a selective or soft product and wait the recommended interval before releasing. Good biocontrol works best when the chemical pressure on natural enemies is low.
Does it work for any crop or area unit?+
Yes — enter the recommended rate per acre for your agent and crop and the area you're treating, and the calculator scales it up. The per-acre release logic is the same whether you're protecting an acre of cotton or several hectares of sugarcane; just match the rate to the agent and pest you're targeting.
Are the figures exact?+
They're sound planning figures. Actual establishment varies with weather, the timing of release against egg-laying, card quality and freshness, and how much spraying disturbs the agents. Use the numbers to order the right quantity of cards and plan the schedule, then scout the crop and adjust the rate or frequency as needed.